If you are in any doubt as to whether you should be doing these exercises, consult your doctor.

　　如果你拿不準(zhǔn)是否應(yīng)進(jìn)行這種鍛煉，咨詢(xún)一下醫(yī)生好了。

　　What can they be doing?

　　他們究竟在干些什么呢？

　　You can't be doing two things at once

　　不能一心二用。

　　I have started planning out what I shall be doing next week.

　　我已開(kāi)始詳細(xì)安排下周要干的事兒了。

　　Anyone could be doing what I'mdoing

　　我在做的事，誰(shuí)都可能正在做。