The SI system therefore takes the ampere as one of its fundamental units.
因此，si制取安培作为它的基本单位之一。
The question is which of the units we choose to be the fundamental one.
问题在于我们选哪一个作为基本单位。
A less fundamental difficulty was a failure to specify units.
另一个稍为次要的困难是未能指定量的单位。
A less fundamental difficulty was a failure to specify units.
另一个稍为次要的困难是未能指定量的单位。
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