“梯形”造句

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

双梯形的试样将产生切变脱胶现象.
A double trapezoidal specimen will generate shear debonding.

阀杆上的短梯形螺纹适用于快速启闭操作.
Stub acme thread on stem provides rapid open - close operation.