The utility model can realize the stepless speed change and has reliable positioning and easy speed change operation and is an ideal speed changing device for the line driving bicycles.

本实用新型可实现无级变速，定位可靠，变速操作方便，是线传动自行车的一种理想变速装置。

youdao

Infinite speed adjusted motor makes speed changing freely.

采用无段变速马达，速度可自由调整。

youdao

It features stable running, even stirring and stepless speed changing, etc.

具有运转平稳、搅拌均匀、无级调速等特点。

youdao

Every time I come to China, I marvel at its dynamism, the breath-taking speed at which it is changing.

UN: Secretary-General

The ROC is a measure of momentum that quantifies the speed at which prices are changing over a specific period.

FORBES: Three Ways To Invest In Emerging Markets Beyond BRIC

But more important is the speed at which attitudes are changing.

ECONOMIST: Gay marriage