Now, to make a square with a side of length 20, we will call.
现在，想要画一个边长是20的正方形，我们可以调用。
To calculate the area of a square double the length of one side.
要计算正方形的面积，只需用边长自乘即可。
Start with a length of each stroke with one arm held down to your side.
开始每个有距离的泳姿只用一只胳膊。
Drag a side selection handle to adjust length of the sleeve.
拖动侧边选择手柄可以调整袖筒长度。
Drag a side selection handle to adjust length of the sleeve.
拖动侧边选择手柄可以调整袖筒长度。
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