介绍了开闭器的结构及其工作原理，分析了开闭器在注射模开模过程和推出机构中的应用。

The structure and working principle of switching ware are introduced, the application of switching ware in opening process and rejecting mechanism of injection mold are analyzed.

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与六千辛A相比，731A开花持续天数较短，开颖角度较小，柱头外露率低，开闭时间略长。

Compared with Liuqianxin A, 731A has a shorter period of flowering days, a smaller angle of glume opening and a longer glume opening time.

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并用前模拉料销、限位拉杆和尼龙开闭器控制开模运动顺序，实现了浇注凝料的自动脱模。

Fixed mould puller pins, stop drag-bars and nylon shutters were used to open the mould sequentially.

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The system can be an open system, or it can be a closed system, or it can be isolated.

系统可以是开系，可以是闭系，或是孤立系。

麻省理工公开课 - 热力学与动力学课程节选

Well at some level it is an ordered sequence of characters. Right? Now it is not represented this same way. You don't see strings inside these open parens and closed parens.

现在字符串不是用这种方式表达的,你没有看到字符串里有开括号闭括号,字符串中间也没有逗号,但是它有同样的属性。

麻省理工公开课 - 计算机科学及编程导论课程节选

It says, if I want to print out something I built in Cartesian form up here, says, again, I'm going to pass it in a pointer to the instance, that self thing, and then I'm going to return a string that I combine together with an open self and close paren, a comma in the middle, and getting the x-value and the y-value and converting them into strings before I put the whole thing together.

这不仅仅是个列表,它是怎么来做的？,流程是：如果我想要返回,一些已经在笛卡尔模式下建好的值，好，再说一遍，我首先要传入一个,指向实例的指针,也就是，然后我会返回一个,由开括号，闭括号,中间的一个逗号,以及提前转换为字符串格式的。

麻省理工公开课 - 计算机科学及编程导论课程节选