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光子没有质量——它们是没有重量的。

Photons have no mass – they are weightless.

《柯林斯英汉双解大词典》

首先，把两个相同重量的物体放进两个盒子里。然后盖上盒子。

First, put two objects with the same weight into two boxes. Then cover the boxes.

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And so you could construct all subsets, check that the weight is less than the weight of the knapsack, and then choose the subset with the maximum value.

因此你可以构建所有子问题，判断它的重量,是否小于背包的重量，然后选择值最大的子问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

Then if the weight of i is less than the available weight, I can return the value of i.

然后如果i的重量,小于剩下的重量，我将返回i的价值。

麻省理工公开课 - 计算机科学及编程导论课程节选

And inside of each of these cups is a different weight so that in theory all of these cups are different weights.

每个杯子里的东西重量都不同,这样，从理论上看，这些杯子的重量都不同。

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