You should be smart 'ough.

你应该聪明一点。

Building a new MRT station is a ough project.

建造新的捷运站是个艰辛的工程。

It is en ough good to achieve this standard there.

在那里达到这个标准已经足够好了。

The letters' ough 'can also be pronounced in a number of different ways.

' ough '这个字母组合在一些不同的单词中也有多种不同发音。

Studying the principle is the most effective, accurate and thor-ough way.

从工作原理着手是最快捷、最准确、最彻底、最有效的途径。