词汇	f-r interval
释义	f-r interval F-R间期
随便看	travelling mechanism gear travelling merchant travel l ing merchant travelling microscope travel l ing microscope Travelling might be my hobby travelling mixer travelling mixing plant travelling mobile library travelling motivation travelling motor travelling motor crab travel l ing motor crab travelling motor hoist Travelling north from Aberdeen Tunnel travelling nut travel l ing nut travelling oven travelling overhead crane travelling overvoltage travelling paddle mixer travelling pan filter travelling pen travelling pencil travelling people