gear continuously variable transmission
齿轮无级变速器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In essence the belt planetary gear continuously variable transmission is a planetary differential train the speed of which is adjustable.
带式行星齿轮无级变速器实质上是一种可无级变速的封闭式差动轮系。
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