The International System has base units from which all others in the system are derived.
国际轨制有根基单位，由此衍生出此轨制中的其他单位。
When overridden in a derived class, this value can take different units of measure.
当在派生类中重写时，该值可以采用不同的度量单位。
When overridden in a derived class, this value can take different units of measure.
当在派生类中重写时，该值可以采用不同的度量单位。
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