公制单位是国际通用的计量单位。

Metric unit is a measuring unit used internationally.

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分析，在这个例子中，是做了使用公制单位。

The analysis, in this example, is done using metric units.

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船体、机械和设备等的设计与建造采用公制单位。

Metric system to be adopted for design and construction of hull, machinery, equipment, etc.

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First there was the observation by Michelson who back in the late 1880s had done very precise interferal metric measurements of the hydrogen lines and had observed that the 656 nanometer line 3 associated with the transition of n equals 3 to n equals 2 was, in fact, a doublet.

首先是麦克逊,在1880年底的观察,他以公制单位对氢原子的光谱线,作了准确的，无其他因素干扰的，测量,发现当n值由3变为2时,会同时得到波长为656纳米的谱线3,实际上是有两条线。

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