重点讲解：
1. take care of 照顾；照看；看护；
例句：You have to learn to
take care of your possessions.
你得学会保管好自己的财物。
2. to a certain degree 在一定程度上；
例句：It is
to a certain degree his responsibility to see that the job is done.
在一定程度上，做好这项工作是他的职责。
3. be based on 以…为基础；
例句：The treatment
is based on statistical theory.
这种处理的根据是统计学理论。
4. and so on 及诸如此类；等等；
例句：People can take bus, subway, taxi, bike
and so on.
人们可以搭巴士，坐地铁，乘出租车或骑自行车等。
5. be supposed to do sth. 应当，应该，须；
例句：You
're supposed to pay the bill by Friday.
你最晚在星期五结清这笔帐
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