是认真的的英文：
mean business

参考例句：

Eleanor was brusque and firm and businesslike.
埃莉诺态度粗暴，意志坚定、办事认真。

We'll get to grips with the problem very soon
我们将会很快认真处理这个问题。

He carefully read the proceedings from last meeting.
他认真阅读了上次会议的记录。

My son' s reaction to the letter was somewhat indifferent.
我儿子并不认真把这封信当回事。

He did his best, therefore, to achieve a mood half sportive and half thoughtful'
于是他尽其所能培养一种半开玩笑半认真的心情。

Take .. seriously; take .. for serious
对..认真

Intense study
认真的研究

I mean it. I'm serious. I'm no kidding!
我是认真的

Be assiduous in one's duties
认真执行任务

I' m in deadly earnest.
我是非常认真的.

mean是什么意思：
v. 想要；意欲；意味着；预定
adj. 自私的；卑鄙的；平均的；低劣的；低微的，卑贱的
n. 中间；平均数，平均值

That was a mean trick!
那是卑鄙的诡计！

A modifier that has little meaning except to intensify the meaning it modifies.
修饰语除了加强修饰词的意思之外没有实际意义。

get money by dishonest means
非法赚钱, 得不义之财

The meaning of the passage is obscure.
这段文字意义晦涩。

No stutter, maybe, but lots of mean.
不口吃，也许。 但是很恶毒。

business是什么意思：
n. 商业，交易，生意；公司，商店；事情；职责

Be engaged in; be Busy in
从事于

to sit for business
因公滞留

As Busy as a bee
(象蜜蜂)忙忙碌碌的

Monkey Business
耍些骗人的把戏、捣鬼

depressed business
不景气的生意