锻炼身体

take exercise

锻炼孩子的身体

get a child to do exercise

体育锻炼

physical exercise

经过适当的锻炼

undergo appropriate training

久经锻炼的干部

experienced and capable cadre

在实际工作中得到锻炼

learn on the job

政治上受到锻炼

gain political experience

劳动锻炼

temper oneself through manual work

实际斗争的锻炼

temper oneself through practical struggle

锻炼意志

build up one's willpower

锻炼记忆力

train one's memory

锻炼出一支不可战胜的军队

build an undefeatable army