1、我们必须尽最大的努力来防止河流的污染.
We must try our best(to prevent the rivers from being polluted).
2、这两国有很多共同之处,他们一致认为无论发生何种情况都应该互相支持
The two countries have many things(in common)and they are in(the state of agreement with each other )that they should support each other(whatever)happens to them
3、这种产品的价格取决于它的质量而不是它的大小.
The price of the product is decided by its quality rather its quantity.
4、听到那个悲伤的消息,他忍不住哭了.
he could not stop crying when he heard the sad news.