Extracting information about the large-scale composition of a planet from a sample weighing a millionth of a gram was a fascinating example of scientific endeavour.

从重量为百万分之一克的样品中提取有关行星宏观组成的信息是一个极为有趣的科学尝试实例。

《柯林斯英汉双解大词典》

It ain't a millionth part of it!

那不是它的百万分之一！

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A microsecond is a millionth of a second.

1微秒就是一百万分之一秒。

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Unfortunately, even the biggest particle accelerators in existence probe energies which are only about a millionth of that.

ECONOMIST: Planck-scale physics

They found that the mucus film was typically less than 35 nanometres thick (a nanometre is a millionth of a millimetre).

ECONOMIST: How tree frogs keep their grip

He accomplished this by using a strobe light to freeze the action of the bullet at a millionth of a second.

CNN: A camera that can see around corners