用可乐浸泡污垢数小时，然后一冲即可。

Pour some cola over the stains and leave it all for a few hours. Then flush the toilet!

youdao

提高低佛氏数水跃的消能率，解决低水头泄水建筑物的下游消能防冲问题，无论从技术还是从经济上来讲都是非常重要的。

Improve the rate of energy dissipation for low Fr hydraulic jump and solve the problem of energy dissipation and erosion , no matter from the technical or economically is very important.

youdao

提高低佛氏数水跃的消能率，解决低水头泄水建筑物的下游消能防冲问题，无论从技术还是从经济上来讲都是非常重要的。

Improve the rate of energy dissipation for low Fr hydraulic jump and solve the problem of energy dissipation and erosion , no matter from the technical or economically is very important.

youdao