“任意的”的英语？

对于任意的截面, 比值Mp/My叫做形状系数.For any section, the ratio Mp / My is called the shape factor.控制单元的形状是任意的.The shape of the control box is arbitrary.如果它们是可见的, 就可以被动态地放到5个任意的位置之一.If they are visible, they can be dynamically positio...