讨论电磁感应定律的两种表述，同时研究两种表述之间的差异，说明了两式在一定条件下是等价的。
Two forms of electromagnetic induction law are discussed. At the same time, We also study the discrepancy between them, and show that two forms of law are equivalent in a certain condition.
了解这两种表述后，我们不仅需要向量场，就是左边这里，这是曲线c上的线积分，向量场在曲线上有定义。
So, in both cases, we need the vector field to be defined not only, I mean, the left hand side makes sense if a vector field is just defined on the curve because it's just a line integral on c.
这两种不同的表述之间相隔11个星期，而差别是如此之大。
The two statements, 11 weeks apart, are extravagantly dissonant.
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