Dependent on the nature of a contract, some relevant terms are implied.

Both express authority and implied authority can create agency.

明示授权和默示授权都能产生代理.

The assumption may be made by express contract or by implication.

承担可以通过明文的契约或默示来作出.

Mastering Chinese is really a way to kill two birds with one stone.

把华文学好是件一举两得的事.

This trip fun and full of knowledge so that was killing two birds with one stone!

这次既好玩,又很有知识性,真是一举两得!

Could you pay our phone bill , too ? You know, kill two birds with one stone.

可以顺便缴我们的电话费 吗 ?你知道的, 一举两得.

Yes, kill two birds with one stone.

有啊, 一举两得.

You could kill two birds with one stone by following our example.

仿效我们的做法,你就可以一举两得.

So, you'll kill two birds with one stone.

这样, 你可以一举两得.

So, you kill two birds with one stone.

所以, 你一举两得.

You can kill two birds with one stone.

一举两得.

They hope, in fact, to kill two birds with one stone.

他们实际上是想一举两得。

Catch not the shadow and lose the substance.

勿抓影子而失去实际(不要舍本逐末).

Grasp the shadow and let go the substance.

舍本逐末.

Catch not at shadow and lose the substance.

勿抓影子而失去实质;不要舍本逐末.

I should not recommend this kind of job to anyone; you get more kicks than halfpennies.

我不想把这样的工作介绍给任何人, 这种事是得不偿失的.

It's not worthwhile for you to write a sequel because the original work is good enough.

你这么做是续貂,得不偿失的.

Then , the efforts we have made to relieve our economic difficulties will be in vain.

我们为纾缓香港经济困境所做的一切,都会得不偿失.

Eventually, they will become frustrated and their teaching performance may be adversely affected.

不但士气受挫,也可能影响教学表现, 得不偿失.

The loss outweights the gain bad cough up!

得不偿失就不好咯!

Do not pay too dear for your whistle.

勿以高价购买毫无价值的东西(勿做得不偿失之事).