• 1. The Normal Curve: 定义并说明常态曲线
• 2. the normal distribution curve: 正态曲线
• 3. The normal quadratic curve: 常态二阶曲线

• 1.And we looked at the component of a vector field in the direction that was normal to the curve.
  我们研究的是，向量场在曲线法向量方向的情况。
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• 2.That is our convention to get a unit normal vector that points to the right of the curve as we move along the curve.
  这是约定的得到单位法向量的方法，这种做法使得，当沿着曲线行进时，法向量始终指向右手方向。
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• 3.A normal distribution is the classic bell curve that appears so frequently in statistics.
  正态分布是典型的钟形曲线，这在统计学中经常出现。
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