This is similar to the principle described Chapter 2 of opening your mind.
这个原则和第二章讲到的打开你的思维相似。
Introduces the structure, work principle and design principle of the opening jerrican transportation machine.
介绍一种敞口油桶搬运机的结构、工作原理和设计原理。
Introduces the structure, work principle and design principle of the opening jerrican transportation machine.
介绍一种敞口油桶搬运机的结构、工作原理和设计原理。
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