玻璃珠箱：手动同步离合器，齿轮转动，滚动撒播，可拆装设计。

Glass Beads Box: Hand movement in step clutch, gear cycle, rolling sowing, and disassembly design.

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换档执行机构的类型包括滑动齿轮、啮合套、同步器、换档离合器和自由轮，其中同步器是汽车变速器中广泛使用的执行元件。

Shift actuator has five different types, such as sliding gears, gear sets, synchronizer, gear clutch and free wheel. And the synchronizer is widely used in automotive transmission.

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