靠练习的英文：
by Exercise
n. 运动，锻炼；练习，习题
v. 锻炼，操练，练习
The exercise is that difficult!
练习题那么难！
morning exercises and setting - up exercises duringthe break
早操和课间操
Exercise stimulates the flow of blood.
锻炼促进血液循环。
Exercise is good for the health.
锻炼有益于健康。
exercising in preparation for strenuous activity.
为紧张活动而做的准备活动。