他的一项研究成果被称为“总时间假说”，即你学习的总量取决于你花在尝试学习它上的时间。

One result of his research is known as the total time hypothesis, which simply means the amount you learn depends on the time you spend trying to learn it.

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这种方式对总碳排放量的贡献依旧很大：占到将近总量的15 - 17%，这比全世界所有交通工具——轮船，汽车，火车和飞机——所排出的碳量还要多。

And its contribution to emissions is still large: say 15-17% of the total, more than the share of all the world's ships, cars, trains and planes.

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总地来说，几乎绝少例外，爱的回报大致上与投入的时间和奉献总量是成正比的。

In general, and with rare exceptions, the returns in love situations are roughly proportional to the amount of time and devotion invested.

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