not 四级六级

I expect not.; I don't expect so.

我认为不会。

Don't waste the flour; there isn't much.

不要浪费面粉，没有多少了。

Don't scold the child.It's not his fault.

别责怪那孩子, 那不是他的过错。

In conversational English “is not” often contracts to “isn’t”.

英语口语中is not常缩写为isn’t。

In conversational English “is not” often contracts to “isn't”.

口头英语中is not常缩写为isn't。

If the hen does not prate,she will not lay.

母鸡不叨不下蛋。

I oughtn't to do that, it's not ethical.

我不该做那件事，它是不合乎道德的。

I didn't flunk but I didn't do too well.

我没有不及格，但考得不太好。

Motherhood doesn't suit her; she shouldn't have had children.

"她不宜做母亲,她不该生孩子。"

I don't care two pins whether she comes or not.

她来不来, 我不在乎。

Don’t look at me! I didn’t say a dicky bird.

别看我！我什么也没说。

What the eye does not see, the heart does not grieve over.

眼不见, 心不烦。

He didn’t flunk out,but his record isn’t so hot.

他没有不及格,但成绩很一般。

"They didn't flunk out, but their records weren't so hot."

"他们勃没有不及格,但成绩不太好。"

Objective To investigate the immunofluoresce nt and immunoblotting features of paraneoplastic pemphigus(PNP).

目的研究副天疱疮患者的免疫学特点。

That doesn't mean I don't get to kibitz a lot.

当然这并不意味着我就不能发表意见了。

If the virus cannot replicate itself, it cannot cause illness.

如果病毒不能变异，也就不能够诱发疾病了。

That chair's not very robust; don't sit on it.

那把椅子不太结实, 别坐它了。

Soames checked his instinctive "Not particular"--he would not chaffer with this alien.

索米斯抑制着那“无所谓”的口头禅没有说--跟这个外国家伙犯不着噜苏。

I wish you wouldn't mumble - I can't hear you clearly.

我希望你说话不要含含糊糊 - 我听不清你在讲什么。