Make sure your hands, the preparation area and the knife are clean.
确定你的手，工作区域和刀都是干净的。
I'm afraid that area is under preparation.
那个地方恐怕还没准备好。
Description of the problem: the preparation of an application calculating the trapezoidal area.
问题描述：编写一个应用程序计算梯形的面积。
Description of the problem: the preparation of an application calculating the trapezoidal area.
问题描述：编写一个应用程序计算梯形的面积。
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