1.battle against 与...斗争，与...较量，与...搏斗
例句：She goes out to battle against depression.
她出门和愁烦作斗争。
2.be a must 必不可少的事物；必要条件
例句：Therefore, leveling will be a must in order to complete some quests.
因此，升级是完成一些任务的必经之路。
3.be a mystery to sb. 对某人来讲是个谜，不明白，不知道
例句：The private lives of the great' men: have ceased to be a mystery to us.
这些伟人的私生活对我们不再是秘密了。
4.be about to 刚要，正准备，就要做...
例句：He is about to turn on the light.
他要把灯打开。
5.be acquainted with 与...认识，了解
例句：Party committees should be acquainted with their work and check up on it, but would not attempt to take it over.
党委应该了解和检查他们的工作，但是不能包办代替。
6.become addicted to 对...入迷，对...上瘾
例句：Smoker who Inhale be likely to become addicted to nicotine
吸烟的人容易对尼古丁上瘾。