We have to forget every one of these rules and use the so called foul methods.

我们必须忘掉这些规则并且去使用这些犯规的方法。

youdao

Unfortunately, the conventional methods suffer from the use of volatile, foul-smelling, low molecular weight thiols that can lead to serious safety and environment problems.

然而，分子量较小的硫醇易挥发、易燃、具有恶臭气味、有毒，不仅对环境造成污染，而且危害使用者的健康。

youdao