英语：do exercise 和do exercises 有什么区别?

英语：do exercise 和do exercises 有什么区别? why should we do exercise英语作文 英语作文 How do we exercise? do morning exercise和take morning exercise有区别吗 do exercise和do exercises有什么区别? do exercise 和do sports 意思一样吗 do exercise 和do sports 意思一样吗 do more exercise中文? do exercise翻译 有关How often do you exercise?英语作文 关于初二英语作文 how often do you exercise 锻炼的英语,do some exercise要不要加ing how often do you exercise用英语怎么说 Grade 9 students should do more/less exercise英语作文, 求why should we do exercise的英语作文? 锻炼的英语,do some exercise要不要加ing what do you think of exercise为题的英语作文. 1英语周报的答案 How often do you exercise