重点讲解：
1. on call
随时待命的；随叫随到的；
eg. In theory I'm on call day and night.
从理论上说，我现在昼夜待命。
eg. The nurse is on call tonight.
这位护士今天晚上值班。
2. be supposed to do sth.
应当，应该做某事；认为；
eg. I'm supposed to be there at five.
我得五点钟到那儿。
eg. 'The President cannot be disturbed,' his son is supposed to have told an early morning caller.
“校长不能见客，”他的儿子应该已经这样告知了一位一大清早就来了的拜访者。
3. turn out
（以某种方式）发生；最后是；结果是；
eg. Sometimes things don't turn out the way we think they're going to.
有时事情并不像我们认为的那样发展。
eg. I was positive things were going to turn out fine.
我确信事情最终会好起来的。
4. be pleased to do sth.
高兴（做…）的；乐意（做…）某事；
eg. We will be pleased to answer any questions you may have.
我们将很乐意回答你们可能想问的任何问题。
eg. I shall be very pleased to help you in every way I can.
我将很高兴地尽我所能来帮助你。