重点讲解:
1. part of 一些;部分;
Part of my bedroom ceiling has fallen in.
我卧室的天花板有些地方塌下来了 。
2. need to do sth. (为做成某事或正常生活)要求有,必须有,需要;
He needs to win this game to stay in the match.
他得赢下这场比赛以免被淘汰出局 。
3. at least 至少;不少于;
It'll cost at least 500 dollars.
这东西至少要花500元 。
4. date back to 追溯(到);开始(于);始造(或建)(于);
The community's links with Syria date back to biblical times.
这个团体与叙利亚的关系可以追溯到《圣经》时代 。
n. 疫苗