因为日历上变化的月份长度，所以对于时间间隔有两个不同的标准测量单位。

There are two different standard units of measure for intervals because of the varying month lengths in calendars.

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该分压器现已作为标准测量设备在我国国家高电压计量站投入使用。

Now, this divider is already put in service at the Chinese National High Voltage Metrological Station as a standard measuring device.

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重点讨论了眼镜片(透镜)中心透射比标准测量装置测量不确定度的来源，详细分析各不确定度分量的评定。

We discuss the sources of the measurement uncertainties of standard equipment for spectacle lens (lens) center transmittance and analyze each components of uncertainty.

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