He became too fat to run quickly.

他太胖了，跑不快了。

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Like stars, brown dwarfs are capable of fusing a rare form of hydrogen called deuterium, but they are too lightweight to burn ordinary hydrogen and quickly run out of fuel.

同恒星相类似，棕矮星能够融化氢原子，但它们重量太轻，它们还不能把融化氢的过程持续下去。

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It was too crowded to flee quickly, she said. "I said, 'I can't run."

街道太拥挤了根本不能很快跑开。

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