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高一英语必修三知识点：Unit4第一课时重要短语（人教版）
1. be fundamental to… 对……是基本的，必需的 this is fundamental to a true understanding of the book. 这对真正理解这本书十分重要。
2. in sb’s presence 当着某人的面，有某人在场
she asked them not to discuss the matter in her presence. 她要求他们不要当着她的面讨论这个问题。
3. be harmful to… 对……有害的
= do harm to… the air here is harmful to our health. 这里的空气对我们有害。
4. there is no harm in doing sth. 不妨做某事
= it does no harm to do sth.
he may not be able to help but there’s no harm in asking him. 他可能帮不了忙，但是求他一下倒也无妨。
5. exist on… 靠……生存
= live on… they exist on very little food. 他们靠极少的食物生存。
6. exist in… 存在于……中
several people believe the devil exists in the world. 少数人认为世界上存在恶魔。
7. in a puzzle 不知如何是好，很迷惑
i am in a puzzle about what he said. 我对他说的话迷惑不解。
8. in time
1）迟早；最后 = sooner or later; eventually
2）及时；不迟 = not late
you’ll learn how to do it in time. 你早晚能学会做这件事的。
will i be in time for the train? 我赶得上那趟火车吗？
9. give birth to… 生出，产出
she gave birth to a second child in january. 一月份的时候她生了第二个孩子。
the chinese nation has given birth to many national heroes and revolutionary leaders. 中华民族养育了很多民族英雄和革命领袖。
10. in one’s turn 轮到某人也（做某事），也 they, in their turn, made a proposal. 他们接着也提了一个建议。
11. by turns 轮流，交替
the two brothers looked after their sick mother by turns. 兄弟俩轮流照看他们生病的母亲。
12. in turn 依次
each man in turn stood up and spoke. 每个人依次站起来发言。
13. it is one’s turn to do sth. 轮到某人做某事
it’s your turn to wash the dishes. 今天轮到你洗盘子了。
14. prevent sb./ sth. (from) doing sth. 阻止某人做某事
= stop sb./ sth. (from) doing sth.
= keep sb./ sth. from doing sth. the heavy rain prevented us going on, but we didn’t lose heart. 大雨阻止我们前进，但是我们不灰心失望。
15. escape from… 从……逃出
who helped him escape from the prison?是谁帮他逃出监狱的？
16. block out
1）挡住（光线或声音）
2）忘掉，抹去（不愉快的事）
black clouds blocked out the sun. 乌云遮住了太阳。
over the years she had tried to block out that part of her life. 多年来她努力想把生命中的那一段经历从记忆中抹去。
17. block off （用障碍物）隔开，封锁
police blocked off the street after the explosion. 在发生爆炸之后，警方用路障封锁了那条路。
18. block up 塞住，封住（孔，洞）
my nose is blocked up because of a heavy cold. 因患重感冒，我的鼻子堵了。
19. crash (sth.) into sth. （把某物）撞到某物上 he crashed his car into a wall. 他的汽车撞到了墙上。
20. pull in
1）（火车等）进站
2）吸引（观众、支持这等）
the train pulled in right on time. 这列火车正点到站。
the new show is certainly pulling in the crowds. 新的表演一定很吸引人。
今天就和大家就分享到这，祝愿各位愉快！