1. uncertain 的用法
2. set off/out (出发)
3. in the air (在空中)
4. in a short while (过了一小会儿)
5. be uncertain about/of (对...不确定)
6. in (one's) search of (寻求)
7. in a hurry (匆忙)
8. bring up (抚育; 呕吐)
9. play the piano (演奏钢琴)
10. at the very beginning (就在刚刚开始)
11. a period of several weeks (在好几周期间)
12. put on a play (上演戏剧等)
13. at the age of 15 (在15岁)
14. A is recognized as B. (A 被认作B。)
75. A is known as B. (A以B闻名。) → as作'当作, 担任, 以......解。
16. of this kind (此类) [of this kind =this kind of]
17. the contributions to ... (对...的贡献)
18. as if 的用法