This engine runs at six thousand revolutions per minute.
Tips
usage
As a measure word, zhuàn counts complete revolutions or laps: 每分钟 3600 转 (3600 RPM). The reading shows up wherever something keeps going round: 转动 (rotate about an axis), 转圈, 自转, 公转, 打转.
memory
Hear the falling fourth tone of zhuàn as the wheel pressing down and rolling on — continuous motion. The dipping third tone of zhuǎn lifts the wheel and points it somewhere new — one pivot.
Vehicle radical on the left — a cart seen from above with axle and wheels. Wheels going round and round is the picture behind the zhuàn reading: continuous rotation, laps, revolutions per minute. Same radical anchors 轮 wheel, 辕 shaft.
Right side 专 supplies the sound (zhuān to zhuàn, tone shift only). Simplified from 專, showing a hand turning a spindle — the spindle image fits the fourth-tone sense perfectly: spinning around and around.