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1.break off 折断
例句：Grace broke off a large piece of the clay.
格雷斯使劲掰掉了一大块陶土。
2.physical exam 体检
例句：Before you conceive, see your health care provider for a physical exam.
在你怀孕以前，让医疗服务人员为你做一次身体检查。
3.at risk 风险
例句：People of all ages are affected, but some groups are more at risk.
各龄年龄组的人都受影响，但有些年龄组的风险更高。
4.instead of 而不是
例句：Why don't you play football instead of just looking on?
你为什么不参加踢足球而只是看热闹?
