New words：

millimetre [ˈmɪlɪˌmitər] n.毫米；千分之一米
millimeter [ˈmɪlɪˌmitər] n.毫米；千分之一米

Sample Sentences：

One centimetre equals ten millimetres.
These jellyfish were only one millimetre long.
Brisbane recorded 790 millimetres of rain in a week.
The land moves northwest by four millimetres per year.

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