这个三角形，底边的长度是20厘米。
这个底边我可以确定啦，因为它是已经给定的，我知道这些三角形的边长。
Well, the base I can decide that I know it because it is part of my given data. I know the sides of this triangle.
携带盒由左、右两盒体及两带有固定卡口的把手组成，分别设在上述三角形底边的两端，即两双面回复反射体的交接侧；
The double-face reflex reflection bodies are respectively hinged together as integration through the conductor hinges and are conducted with the circuit.
携带盒由左、右两盒体及两带有固定卡口的把手组成，分别设在上述三角形底边的两端，即两双面回复反射体的交接侧；
The double-face reflex reflection bodies are respectively hinged together as integration through the conductor hinges and are conducted with the circuit.
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