The margin of error was plus or minus three percentage points.

误差幅度在三个百分点左右。

《牛津词典》

It is the value plus or minus something.

而是这个值加上或减去某个东西。

youdao

The results appear to be accurate to within plus or minus 9 years.

试验结果显示的最大误差为正负9年。

youdao

Getting a grade like a B-plus or a C-minus adds or subtracts a few tenths of a point.

VOA: special.2009.03.05

So we can have, if we have the final quantum number m equal plus 1 or minus 1, we're dealing with a p x or a p y orbital.

所以如果我们有,磁量子数ｍ等于正负１,我们讨论的就是ｐｘ或者ｐｙ轨道。

麻省理工公开课 - 化学原理课程节选

Anything where you're actually keeping track of something like a score that's having a variable that you increment -- plus, plus, or decrement, minus, minus, using the appropriate puzzle piece could certainly be compelling.

你需要保存像分数这样的事物时,你就需要一个变量,它可以自加，++，或者自减,要使用正确的拼图。

哈佛公开课 - 计算机科学课程节选

The survey's overall sampling error is plus or minus 3 percentage points and plus or minus 6 percentage points for the African-Americans sample.

CNN: STORY HIGHLIGHTS

This one showed Bush drawing 49 percent to Kerry's 48 percent in a hypothetical matchup, well within the poll's margin of error or plus or minus 4 percentage points.

CNN: Democrats battle for Tennessee, Virginia

The margin of error for poll results among registered voters who say they are Democrats or lean Democratic was plus or minus 5 percentage points.

CNN: Poll: Saddam's capture boosts Bush's ratings