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单词与短语：
1. be supposed to
应该，被期望
eg. Every pupil is supposed to be in his classroom at 9 a.m.
上午9点时每个学生都应当在教室里。
eg. The details were supposed to be secret but somehow leaked out.
这些细节原属秘密，可是不知怎么给泄露出去了。
2. on the verge of
接近于； 濒于
eg. Her eyelids drooped as if she were on the verge of sleep.
她眼睑低垂好像快要睡着的样子。
eg. The company is on the verge of insolvency.
该公司快要破产了。
3. keep away from
远离；避开
eg. We should keep away from being a sybarite.
我们不能做个奢侈逸乐的人。
eg. Keep the children away from the machine.
别让孩子们接近机器。
