重点讲解：
1. in balance
平衡；总而言之；
eg. To keep ecology in balance is our duty.
保持生态平衡是我们的职责[WAmg=fKaWHJ3。
eg. Since the structures designed by civil engineers are intended to be stationary or stable, these forces must be kept in balance.
土木工程师设计的目的就是使建筑物的结构稳定，所以建筑物上的各方力都必须平衡CGTui9]qQGfEGx|TR。
2. stay away from
不去，远离（某地）；
eg. The doctor told him to stay away from fat food.
医生叫他不要吃高脂肪的食物9XPyGwdlf*;U。
eg. Flu is catching, so stay away from work.
流感是会传染的，所以别去工作了)23h!dd=a]vXcpHtc。
3. in general
总的来说；总体上来看；大体上；
eg. People in general will support us.
总体而言，人们会支持我们的E4Jpkj2tci。
eg. In general, I agree to what you said.
我大体上同意你所说的nbtB5YoehTjhb。
4. once in a while
偶尔；间或；
eg. Earrings need to be taken out and cleaned once in a while.
耳环要偶尔取出来清洗一下G4L&B+I+)2mNfRFiHQ。
eg. Once in a while she phoned him.
她间或会给他打个电话dY4adM&%Jta2)(F。
5. for sure
无疑；肯定；
eg. No one knows for sure, of course.
当然，没人知道确切答案97Z2^Z*QBUGcax5。
eg. For sure, we're headed for a time of abundance, at least in quantity.
毫无疑问，我们正迈向一个信息丰富（至少在数量上是这样）的时代a)LPE#_W&x%=#5*yrL@。