No, not two, not three, just a single feature.

是的，不是两个，也不是三个，只写一个。

youdao

Don't worry, it will download only once, not three times!

不要担心，将仅仅下载一次，而不会下载三次！

youdao

Within a year's time, many Americans should have access to two, if not three, 4g networks.

在一年的时间内，很多美国人可以连入至少2个，或是3个4g网络。

youdao

University of Illinois Professor May Berenbaum says it appears that bees could deal with one or two viruses at the same time, but not three or four.

VOA: special.2009.09.22

I'm not going to writegiven threemoles of hydrogen at one bar and three degrees, blah,bla I'm going to write it in a compact notation.

我不会写“给定1巴和多少度下,的三摩尔氢分子之类,我会把它写成一个紧凑的形式。

麻省理工公开课 - 热力学与动力学课程节选

It was not even like that three years ago, which I think is a really bad mistake.

三年前还不是这样，这次我觉得真的错得很离谱。

纽约的公共交通 - SpeakingMax英语口语达人

However, in the West Indies, both sides will be allowed only two unsuccessful challenges per innings, not three.

BBC: Referrals change for England tour

It means, instead, that success is governed by four, not three, variables: talent, industriousness, social intelligence, and opportunity.

FORBES: Dear President Obama, You Can't Create Growth, But You CAN Suffocate It

Where it was thought one fiber line could serve 1, 000 homes, now it will take two, if not three.

FORBES: All Over the Map