quadrilateral control by foreign powers
受四方面外国势力控制
quadrilateral control by foreign powers
受四方面外国势力控制
A kite is a quadrilateral with one line of symmetry.
风筝是个有一条对称线四边形。
According to the principles of infinitesimal calculus,a new method on how to ratiocinate the arbitrary quadrilaterals area was put forward.
利用微积分原理给出任意四边形面积公式推证一种新方法。
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