system of measurement

常见例句

• There are two systems of units in common use in mechanics.
  在力學中通用兩種單位制。
• The unit of impulse, in any system, equals the product of the units of force and time in that system.
  在任一單位制中，沖量的單位等於該單位制中力和時間單位的乘積。
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