When the product of value and weight is positive, it contributes to pushing the sum above zero.

当值与权重的乘积是正的时，它有助于促使和大于0。

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They can simply check to see if the count is zero (empty) or a positive number (not empty).

它们可以轻松检查count是零(空)还是正数(非空)。

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What is important to remember is that the formulas represent neutral compounds where the positive and negative charges add to zero.

重要的是记住分子式是代表中性化合物，正负电荷加和为零。

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we learned that the average number of romantic relationships for people to take positive psychology in 4 years is between zero and one.

我们了解到上积极心理学课的人,在4年里恋爱次数的平均数在0到1之间。

哈佛公开课 - 幸福课课程节选

I'm pressing on the gas. So I expect that to be a positive number. The pressure is constant 0 p. The V goes from V1 to zero.

我们对气体加压,所以这应该是一个正数,压强是常数，p，V从V1变成。

麻省理工公开课 - 热力学与动力学课程节选

In contrast to the stock market, which over long periods offers positive returns linked to the growth in the economy, commodity trading is a zero-sum game.

FORBES: In The Money