millionths
n.
第一百万,百万分之一( millionth的名词复数 );
例句:
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Natural starch particles are roughly 30 microns or millionths of meter wide.
天然淀粉粒子的体积大约是30微米,也就是几百万分之一米.
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That is less than two millionths of one second.
来自VOA
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The difference can be as little as nine-millionths of a second.
来自NEWYORKER