There is an appreciable scale effect on wake fraction, and the wake fraction decreases as the size of models increases.

伴流分数有明显的尺度效应，随模型尺度的增加而下降。

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This theory holds that in its early history, the observable Universe underwent a period of exponential expansion, doubling in size many dozens of times, growing our observiball a tiny fraction of the size of an atomic nucleus to that of, say, a beach ball.

BBC: The observable Universe and beyond

Mr Romney's headquarters, in a drab low-rise building in Boston, is a fraction the size of Mr Obama's.

ECONOMIST: The Obama campaign

Cutting the size of the nuclear arsenal to a small fraction of its Cold War size and focusing on terrorists rather than state-based threats may seem sensible in the present environment, but the decisions the administration is making will have consequences for decades after it leaves office.

FORBES: Nuclear Weapons: How Few Is Too Few?