重点讲解：
1. need to do sth.
（为做成某事或正常生活）要求有，必须有，需要；
eg. A baby does not need to wear shoes until he starts to walk.
婴儿在开始走路前不需要穿鞋。
eg. I need you to do something for me.
我需要你为我做点儿什么。
2. at last
终于；最后；到底；
eg. He showed his sinister motive at last.
他终于露出了他那邪恶的用心。
eg. Mr. pearson won his suit at last.
最终皮尔逊先生赢得了他的诉讼。
3. care for
照料；照顾；护理；
eg. We all care for each other, love and help each other.
不过我们都互相关心、互相爱护、互相给予帮助。
eg. Kevin arrived right on cue to care for Harry.
凯文到的正是时候，可以照顾哈丽。