He raised his hat and was about to speak to her, but she gave him the go-by and kept on walking.

他脱下帽子，正想和她打招呼，但她却视若无睹，扬长而去。

That's a good rule to go by.

那是要遵守的好规则。

If they prove that I was wrong, then I'll go by what they say.

如果他们证明我错了，那么我就会照他们说的去做。

It's a case of not what you know but who you know in this world today and qualifications quite go by the board.

现在社会的情形不是看你知道什么，而是看你认识谁，学位也基本被忽略了。

Sometimes I go by car.

有时我坐车去。