I mention this point now in passing and shall refer to it again.
这一点现在顺便提一下，以后还会讲到。
Current is the rate of flow of electric charge passing a point.
电流是电荷流过—个点的速率。
Pay attention to passing over the departure point correctly.
注意正确通过起点。
Pay attention to passing over the departure point correctly.
注意正确通过起点。
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