重点讲解：
1. well-tunned
调整好的；
eg. She is not very well tuned into her surroundings.
她不太适应周围的环境。
eg. The system is not well tuned to handle this sort of problem.
该系统并没有调到最佳状态来处理这些问题。
2. hear of
听说（过…）；（对…）有一点了解；
eg. Your mother will be furious if she gets to hear of this.
你母亲若知此事定会怒不可遏。
eg. I've never heard of such places.
我从未听说过这些地方。
3. take off
下班；离开；
eg. He tells me I should take off early, that my boss will understand because this is an extenuating circumstance.
他说我应该可以提前下班，我的老板会理解的，因为毕竟情有可原。
eg. I think we get to take off early today for ice.
今天会结冰，我认为我们可以提早下班。
4. lock up
锁好（建筑物或汽车的）门窗；
eg. Don't forget to lock up before leaving home.
离家之前别忘上锁。
eg. People usually lock up before they go to bed at night.
人们夜晚就寝前一般都锁好门窗。