有些包有糖衣的玉米片含糖量为50%。

Some sugar-coated cereals are 50% sugar.

《柯林斯英汉双解大词典》

政府推荐的普通成年人每日蛋白质摄取量为平均每天50到60克。

The government's recommended daily allowance for the average adult is 50 to 60 grams of protein a day.

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这一点很重要，因为理论表明，当目标鱼种的生物量为其原始水平的50%左右时，渔场才能达到可收获的最大可持续产量。

That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.

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That is, most processes that we're concerned with, they'll happen with something held constant like pressure or temperature or maybe volume.

这句话是说我们所关注的大部分过程，发生的时候都是保持某个量为常数,比如压强，温度或者体积。

麻省理工公开课 - 热力学与动力学课程节选

So, if we think about the second case here where we have c n minus, now we're talking about a molecule with a net charge of negative 1.

那么，如果我们考虑的是第二个例子,也就是氰离子，那么现在我们讨论的是一个净电荷量为负一的分子。

麻省理工公开课 - 化学原理课程节选

So let's do this considering, for example, what it would look like if we were to write out the electron configuration for oxygen where z is going to be equal to 8.

我们来做这个考虑，举例来说,如果我们写出,有效电荷量为8的氧的电子构型。

麻省理工公开课 - 化学原理课程节选