clean的现在进行时

clean的现在进行时：cleaning

n.打扫;扫除;清洁

v.除去…的灰尘;使…干净;打扫;变干净;(烹调前给鱼、鸡等)清除内脏

例句：

Cleaning services have been put out to tender.

清扫工作已经对外招标。

Cleaning fluids should be kept out of the reach of children.

洗涤剂应该放在儿童够不到的地方。

I spent hours cleaning the house, but there isn't much to show for all my efforts.

我花了几个小时来打扫房子，但费了这么大力气却看不到多少效果