“四边形”造句

这是平行四边形的对边.
These are the opposite sides of the parallelogram.

这种作图法常被称为矢量相加的平行四边形法则.
This construction is often called the parallelogram law of addition of vectors.

梯形是具有两平行边的四边形.
A trapezoid is a quadrilateral with two parallel sides.

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