at a time 是每次的意思,那么three at a time 和two at a time

at a time 是每次的意思,那么three at a time 和two at a time a man can't step into the same river at the same time 什么意思?是一心不能二用的意思吗谢谢 I listen to tapes_____.A.at times有时候 B.all the time总是一直 C.at all times总是 D.at a time每次 意思都对吗?为什么选B?其它的为什么不可以? change one's life one step 准确意思是什么He attempted to change his life one step at a time他每次都试图让自己的生活上一个台阶 是这意思吗 three at a time 的意思是三步并作一步,那么三步并作两步可以说成是three at two times吗?make a century除了活一百岁的意思外,还有得一百分的意思吗? one at a time还有two at a time 的意思,相应的three at a time don`t all speak at once,one at a time.啥意思? 这几个短语的意思 at a time at one time in modern time in time put out put away one day at a time的意思是活一天算一天的意思 还是珍惜每一天的意思? Don’t all speak at once!_________,please .A.Each at one time B.One by one time C.One for eachb的one by one是一个一个的 为什么不对D.One at a time one day at a time 的意思及用法 Trouble never comes at a convenient time的意思 为什么time作为时间的意思在这个句子中“what a good time I have at the party”是可数的?time这个词什么时候可数,什么时候不可数? at time,at times,at a time的区别, at a time ,at one time ,at the time ,at all times四者之间的区别和联系,既具体的意思解释. one day at a time什么意思 区别time词组at a time一次; 同时; 每次 at one time(过去)有个时期; 曾经,一度 同时 at the time 当时,在那个时候 for a time 一度,暂时 for the time being 暂时,暂且 这些意思有些重复 怎么区别呢 还有 怎么 at no time 是 什么意思?