当真的英文：
mean business

参考例句：

Do you really believe that sophomoric argument?
你当真相信那种幼稚可笑的论点吗？

My heavy heart. Then thou didst bid me bring;And let it drop adown thy calmly great
我这颗沉甸甸的心。可是你，;你当真命令我捧着它，投到

Are you teasing or in earnest?
你是开玩笑还是当真？

I say this in all earnestness.
我这么说可是当真的。

Don't take it seriously - he's only teasing.
别把它当真，他只不过是在开玩笑。

I am not serious, I was only joking with you.
我并没有当真，只是和你开个玩笑。

You have taken my little joke too much to heart.
你把我的小玩笑太当真了。

We can’t take you seriously when you just bandy words
你是在吵嘴,我们无法把你的话当真。

I only gave her a ribbing, but she took it seriously.
我只是跟她开个玩笑，可她却当真了。

“Are you in earnest?” he asked in a deadly calm voice.
“你可当真？”他带着极为镇定的口吻问。

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