重点讲解：
1. carry out 实施；执行；实行；
例句：He balked me to carry out my plan.
他阻止我实施我的计划。
2. in contact with 有联系；接触；
例句：They compared how these organisms behaved when left in contact with different materials.
他们比较了与不同材料接触时这些生物体的反应。
3. in terms of 在…方面；从…角度看；根据…来说；
例句：The book is well organized in terms of plot.
这本书的故事布局十分严谨。
4. due to 由于；因为；
例句：Some students quit school due to poverty.
一些学生因贫困而辍学。
5. in contrast to 与…截然不同；与…对比鲜明；
例句：His public statements have always been in marked contrast to those of his son.
他和他儿子在公开场合的言论总是截然不同。
6. lag behind 落后；赶不上；
例句：It often happens that thinking lags behind reality.
思想落后于现实的事是常有的。
