单词：simple tangent
simple tangent的用法和样例：
例句
- The graph of a concave function is always below its tangent.一个凹函数的图象总在它的切线的下方。
- Both of approaching and returning movements are along the tangent of the circle.绕转之后移动方向为自南向北，也是沿圆周的切线运动。
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