A surge in domestic sales helped compensate for a fall-off in export sales.

国内销售的增长帮助补偿了出口销售的减少。

Although the market has been flat, residential property costs remain high. Nevertheless, the fall-off in demand has had an impact on resale values.

尽管市场一直疲软，房价持续偏高。然而需求的减少还是对二手房价格产生了影响。

Our sales have begun to fall off.

我们的销售额已经开始下降。

His strange habit makes sense when you consider that he's an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road.

他是一位研究如何减少垃圾的环境科学家，其中包括研究减少垃圾车行驶时掉下来的东西，当你考虑到这一点，自然就能明白他为什么会养成这种奇怪的习惯了。

In 'come back', 'break down' and 'fall off', 'back', 'down' and 'off' are all adverbial particles.

在come back、break down和fall off中，back、down和off都是副词小词。