1. medium n. 手段，媒介

He prefers a happy medium in life.
他在生活中甘居中游。

2．intelligent a. 聪明的，智能的

Though very intelligent, she is nevertheless rather modest.
她很聪明，倒也很谦虚。

3. profound a. 深奥的，渊博的

Since losing his job, he has often experienced a profound sense of ennui.
他自从失业以来，常觉百无聊赖。
4．conscientious a. 认真的，谨慎的

The janitor is very conscientious.
那个管理员很认真。

5. conflict n. 冲突，战斗

There has always been some conflict between the sexes.
两性之间从来就有矛盾。