6. cost/pay an arm and a leg

（X）一手一腳

（O）花一大筆錢

Example 1:

The best business investments shouldn’t cost an arm and a leg.

最好的商業投資不應該花費一大筆錢的。

7. be on its last legs

快壞了；快不能用了

Example 1:

The router stopped working again today—it must be on its last legs.

路由器今天又再次停止運作了，看來快壞了。

8. pull (somebody's) leg

捉弄；和…開玩笑

Example 1:

A: Lorenzo said he'd like to terminate the contract.

(Lorenzo說他想終止合同。)

B: Are you pulling my leg?

(你在講笑嗎？)

A: No. I'm telling you the truth.

(不，這是真話來的。)

9. shake a leg

（X）腳

（O）（用於催促）快點行動；快點動手

Example 1:

I want to have a look at the report before sundown, so let's shake a leg.

我想在日落之前看看報告，所以麻煩大家抓緊一點時間。