3.heart +快速搏动；mind, thoughts +急速运转
I made sure I sounded calm but my mind was racing.我一边努力让声音平静下来, 一边脑子转得飞快。
to race through sb's mindthoughts +在某人的头脑中掠过
Bits and pieces of the past raced through her mind.往昔的点点滴滴飞快掠过她的脑海。
race aheadmind, progress +超前；急速发展
4.engine, shaft, propeller +猛转
He heard the sound of the engine racing.他听到了发动机急速转动的声音。