翻译 1)He exercised until his body cried for a rest.2)Don't let the high prices keep you from starting a collection of your own.为什么是let us not play 而不是let us don't play

翻译 1)He exercised until his body cried for a rest.2)Don't let the high prices keep you from starting a collection of your own.为什么是let us not play 而不是let us don't play He was ___ for the lawA practiced B drilled C exercised D trained 翻译：un-presenter-like manner Grandpa is pretty healthy because he every day.A.takes exerciseB.take exerciseC.do exerciseD.takes exercises UN 英语UN用汉语怎么翻译 la vie est un combat翻译法语 求西语eres un tanto的翻译 un believ able该怎么翻译? UN-approved是什么意思翻译一篇英文,出现UN-approved这个词,请问该怎么翻译? 如果级数Un收敛,1/Un的敛散性? {Un}收敛于a,{Un+1}收敛于多少 若lim Un=A>0,用数列定义证明lim Un+1 / Un =1 极限un 等于a则级数（un-un-1）收敛于什么? 设数列un收敛于S,则级数un+1-un收敛于 证明：若正项级数∑Un收敛,则∑Un/(1+Un)也收敛 若级数Un收敛于s 则级数(un+un+1)收敛于 设级数∑un收敛,证明∑(un+un+1)也收敛