短语
课余体育锻炼
extracurricular physical exercising
;
after-class sport training
;
out-class physical exercise
余钟炼
Darkmore-yu
课余锻炼
inner class training
参与课余体育锻炼
participate the after-class physical exercises
重金属冶炼余热的利用
waste heat utilization in extractive metallurgy of heavy metals