【词组解析】
1.in turn 依次,轮流;转而
（1）The students were summoned in turn to be interviewed.
学生依次被召入进行口试。
（2）Theory is based on practice and in turn serves practice.
理论的基础是实践，反过来理论又为实践服务。
2. in vain 徒劳,白费力
（1）They attempted in vain to modernise these antiquated industries.
他们企图使这些陈旧的工业现代化，结果劳而无功。
（2）Their lives have not been laid down in vain.
他们并没有白白牺牲。
3. indifferent to 无兴趣,不关心
（1）The government cannot afford to be indifferent to public opinion.
政府不可不关注舆论。
（2）He was coldly indifferent to other people.
他对其他人冷若冰霜。
4. indignant with 愤慨
（1）He was very indignant with his wife over her improper conduct.
他对他妻子的不端行为感到非常愤慨。
（2）She was indignant with his presumption and self-satisfaction and conscious rectitude.
她恼火他的傲慢自满和自以为是。
5. innocent of 无...罪,无辜
（1）The accused person stuck out that he was innocent of the crime.
被告一口咬定说他是无辜的。
（2）I believe he's innocent of the crime.
我认为他是无罪的。
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