1. Beat a dead horse

鞭打死馬令其奔馳（徒勞）

I don't want to beat a dead horse. = I don't want to repeat something over and over again.

我不想重復的說一件事。

例子：I hate to beat a dead horse, but it is very important that you understand this before you leave.

我不想多此一舉。但你離開以前必須了解這個。

2. Beaten by the ugly stick

被丑杖打過（生的難看）

She was beaten by the ugly stick. = She is very ugly.

她生的很難看。

例子：Did you see that dog? It looked like someone beaten by the ugly stick.

瞧見哪知狗沒有？ 真難看，看來像被丑杖打過。

3. Beggars can't be choosers

討飯的談不上挑三揀四。

I know that beggars can't be choosers. = I know that if I am desperate I cannot be selective.

我知道在我走投無路的時候，我不能嫌好道歹。

例子：I didn't want to eat at this restaurant, but it is the only place that is open this late at night. I suppose that beggars can't be choosers.

我不想光顧這家飯店，但這么晚，別家都關門了。這時候我不嫌好道歹。