Don't become too confidential with strangers.

对陌生人不能太信任。

Not arrogant with victory, not dishearten with setback.

例句〗胜利了不要骄傲，失败了不要～。

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

我认为不会。

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

我不该做件事，它是不合乎道德。

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

英语中is not常缩写为isn't。

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

英语语中is not常缩写为isn’t。

Do not meddle in things that do not concern you.

别参与和自己无关事。

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

"她不宜做亲,她不该生。"

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

她来不来, 我不在乎。

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, 不是他过错。

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

目研究副肿瘤性天疱疮患者免疫学特点。

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。"

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

把椅不太结实, 别坐它了。

Be not just to excess, and be not overwise, lest you be ruined.

不要过于正义，也不要自作聪明，免得自趋灭亡。

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

我没有不及格，但考得不太好。

If the door's not exactly true it won't close properly.

这扇门如果安得不正确就关不上。

Although she did not reciprocate his feelings, she did not discourage him.

尽管她没有回应他感情，她也没有使他丧失信心。

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。