The teacher told us to look at the blackboard.
老师叫我们看黑板。
重点词语：look n.看，注视 vt.注视
商务用语：look into 观察，调查
look to 期望
a new look 新貌
I cannot find my watch; I must have lost it.
我找不到手表了，我一定把它给丢了。
重点词语：lose vt.亏损，浪费，遗失 vi.受损失，失败
商务用语：lose control of 失控
lose by 因……而遭受损失
