I got B plus (B+) in the test.

我考试得了个B+。

《牛津词典》

For A or B to happen, the probability amplitude is alpha plus beta.

如果让A或者B发生时，那么概率幅是alpha加上beta。

youdao

And again, if we write out what all the terms are, we again have 1 s a squared plus 1 s b squared, but now what we're doing is we're actually subtracting the interference term.

同样，如果我们把所有的项都写出来，同样我们有1s平方加上1sb平方，先现在我们做的是,我们要减去干涉项。

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 the profit is 2 S1 plus S2 plus B S1 S2 minus S1 squared.

利润是2-S1平方

耶鲁公开课 - 博弈论课程节选

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These are known as B, B-bar, B-plus and B-minus.

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