Rated frequency is 50Hz. The JP2 double-speed finishing motors are with speed-change switch for changing quick or slow speed easily.

额定频率为50Hz，JP2D双速磨光电机可带速度转换开关，方便快慢速度的转换。

youdao

SONG CHANGE - SWITCH exercises.

歌曲的变化——开关练习。

youdao

The Maldivian leader wants countries like his to embrace green technology, switch to clean energy, and show the way to those who are opposed to change.

VOA: standard.2009.11.09

It's a switch that from outside can be used to change the life of a cell.

这种来自外源的变化能够改变细胞的状态

耶鲁公开课 - 生物医学工程探索课程节选

Both models feature a new capacitive touch control design that allows the listener to change volume, switch channels or jump streams with a simple swipe or tap.

ENGADGET: Koss intros Striva headphone systems, lets you stream music over WiFi straight to your ears

The key change is a switch from volume to quality.

FORBES: Quality vs Quantity

Radical versus incremental change - how to SWItCH urban water systems to meet current and future challenges?

UNESCO: World Water Assessment Programme (WWAP)