If you remember these magnets.
如果你还记得这些磁铁。
What this means is that, if you remember these magnets.
这就是说,如果你还记得这些磁铁。
You swim there without danger if you remember these instructions:1.
你在那里游泳没有危险,假如你还记得这些说明:1。
And, if you ever get confused, the way to remember these is that you know energy is the integral of a force moving through a distance.
如果你感到很困惑的话,可以这么来记,能量是在沿力的方向进行路径积分。
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