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重点讲解：
1. so far 目前；迄今为止
So far eight workers have been killed.
到目前为止已有8名员工遇难。
2. find out 找出；发现
I'll find out and get back to you.
我查明之后再答复你。
3. sold out 售罄的；脱销的
The stores are sometimes sold out of certain groceries.
这些店铺的某些杂货有时会脱销。
4. be lower than 比...低的；低于
The cello is lower than the violin.
大提琴的声音比小提琴低沉。
