外研版新标准英语九下M4U2的主要内容是一篇游记，文章按照时间顺序描述了作者在野外宿营时遇到熊的惊险经历。
U2重点句子
词源解说：直接源自古英语的clne，意为清洁，纯洁。词语用法 clean用作形容词的基本意思是“清洁的,干净的”,指实际上无污垢的人或物,也可作“新的,未用过的”“正派的; 诚实的; 纯洁的; 正大光明的”“整齐的; 表面。
1.Watch out!Bears about!当心！附近有熊！watch out 当心/小心
2.On the first evening，the three of us were tired after walking for about eight hours.在第一个晚上，在走了大约8小时以后，我们三个人都很累。（1）on the first evening在第一个晚上 on 用于具体时间前（2）the three of us 我们三个人，the表示特指（3）after walking，after是介词，后面动词加ing形式。
3.We soon fall asleep.我们很快就睡着了。fall asleep 睡着；入睡
4.In the middle of the night，I heard a strange noise outside.半夜，我听见外面传来奇怪的声音。（1）in the middle of the night=at midnight 半夜（2）noise 噪音（除sound和voice外)
5.But when I looked out of tent，there was nothing there.但是当我向帐篷外面看时，什么也看不到。look out of 向......外面看
6.In the morning，I got up to make breakfast.早上我起来做早饭。（1）in the morning早上(2)get up 起床（3）make breakfast 做早饭
7.We should hang the food in a tree tonight.今晚我们应该把食物挂在树上。in a tree在树上，in强调外来东西在树上；on强调树上本身长的东西。There are many birds in the tree./There are many apples on the tree.
8.Later that day，we stopped in a beautiful field by a stream.那天傍晚，我们在小溪旁一块漂亮的田野里停下来。（1）later that day 那天傍晚（2）by a stream 在小溪旁
9.We put up the tent and fell asleep.我们搭起帐篷，然后睡着了。put up 搭起；架起；张贴Don't put up these pictures on the wall.
10.It wasn&39;t have enough clean water to drink.
11.We must keep the camp clean.我们必须保持营地干净。Keep sb./sth.+形容词，使某人/某物保持某种状态，We can make our classroom beautiful.keep sb./sth. doing sth.让某人某物一直做某事，Don't keep her waiting for long.keep doing sth.一直做某事Keep studying，you will make great progress.
12.Let's tidy up and move on.让我们整理干净，继续前行。（1）tidy up整理；收拾，代词it/them放中间Can you tidy it up?（2）move on 继续前行
13.And we should make lots of noise too. 我们也应该多弄出响声来。make lots of noise 发出更多响声
clean and nice both clean and nice 两种都可以 .第一时间为你解答，敬请采纳，如对本题还有疑问可追问，Good luck!
14.You mustn't make any sudden moves or make a sound.你们不准突然移动或发出声音。（1）make any sudden moves 突然移动（2）make a sound 发出声音
15.And above all，you mustn't run. 最重要的是，你绝对不能跑。above all 尤其是；更重要的是
tidy 干净的，漂亮的
16.While the others were resting，I went for a walk inthe forest.当其他人休息时，我去森林里散步。（1）while当......时候，引导时间状语从句。while从句动词为延续性动词，常用（过去）进行时态。while从句也可以和主句同时用进行时态，此时while译成“而”。While the students were talking in the classroom，the teacher came in./While I was doing homework，my mother was cooking.（2）the others 其他人，表示同一个范围内剩余的全部。（3）go for a walk=take a walk 散步（4）in the forest 在森林里
17.Suddenly，I saw a baby bear playing with some sticks and stones.突然，我看见一只小熊在玩树枝和石头。（1）see sb./sth. doing sth.看见某人/某物正在做某事，表示动作正在进行。I saw the boy playing football in the playground.（2）play with 玩弄；摆弄
18.He looked so soft and friendly，and I remember thinking，“If I reach out，I can just touch him.”它看起来很柔软和友好，并且我先还记得当时在想：“如果我伸出手，我就能摸到它。”（1）look看起来，系动词，加形容词。（2）remember doing sth.记得做过某事（3）reach out （for）...伸出手（够）......Don't reach out for those apples on that tall tree.
这里又漂亮又干净英语，19.I stood very still.I didn't even turn my head.我静静地站着，甚至没有转头。（1）stand still 静静地站着（2）turn one’s head 转头
20.The baby bear looked up，and ran towards me.那只小熊抬头看了看，向我跑过来。（1）look up 抬头看；查找I am looking these words in the dictionary.（2）run towards 向......跑过来
21.Then slowly I turned round，and I saw the baby bearand his huge mother walking away.然后我慢慢地转过身来，我看见那只小熊和它的身体庞大的妈妈正在走开。（1）turn round 转过身（2）see sb./sth. doing sth.看见某人/某物正在做某事，表示动作正在进行。（3）walk away 走开
22.For the next ten days，every time there was a sudden noise，my blood went cold.在接下来的十天里，每次听到突然的声响，我都会心惊胆战。（1）for the next ten days在接下来的十天里（2）every time 每次
U3重点句子
1.No smoking. 禁止吸烟。
2.No eating or drinking. 禁止吃喝。
3.Children crossing. 当心过马路的孩子。
4.Danger! Be careful of falling rocks.危险！当心下落的石头。（1）be careful of 小心；当心（2）falling rocks 正在下落的石头/落石
5.Children should be taken care of by parents. 孩子们应该由父母照顾。take care of=look after 照顾
6.Do not drink and drive. 禁止酒后驾驶。
7.Check in at the main gate. 在大门口登记。（1）check in 登记（2）at the main gate在大厅
干净漂亮 Clean and pretty
8.Wear a hard hat at all times. 一直戴着安全帽。at all times 一直
9.Wear the correct climbing shoes. 穿着合适的（登山）鞋。climbing shoes （登山）鞋
10.Don't listen to personal music players while climbing. 攀登时不要听个人音乐播放器。（1）listen to 听 （2） personal music players 个人音乐播放器
11.Don't talk on a mobile phone while climbing. 攀登时不要打电话。talk on a mobile phone 打电话
12.with his drawing in his hand 手里拿着他的画 with sth.+介词短语 with a book in her hand
13....people must wake up to the fact that pollution is causing damage to the progress we've made.人们必须认识到这个事实：污染正在对我们取得的进步构成危害。wake up to the fact 认识/清醒地面对这个事实
16.I told my family why we should turn off the light when we leave a room. 我告诉我的家人当我们离开房间时为什么应该关灯。turn off the light 关灯
19.Ecotourism is also known as “responsible tourism.”生态旅游也被称作“负责任的旅游”。 be known as 因为......有名；被称作；被认为
20.Take rubbish away with you. 将垃圾随身带走。take sth.away with...随身带走......
21.Take photos but nothing else. 只拍照不做其他事。(1)take photos 拍照（2）nothing else 没有别的，else放在特殊疑问词后或不定代词、不定副词后面
It is clean and beautiful它干净而且漂亮
22.Don't make open fires in the forests. 不要在森林里点明火。（1）make open fires生明火（2）in the forests 在森林里
