利用机械式无级变速器与行星差速器组合成无级调速差动机构，具有许多优点。
The differential device with stepless speed regulation, which is composed of a mechanical stepless speed governor and a planetary differential device, has many advantages.
利用机械式无级变速器与行星差速器组合成无级调速差动机构，具有许多优点。
The differential device with stepless speed regulation, which is composed of a mechanical stepless speed governor and a planetary differential device, has many advantages.
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