by this time 是什么意思

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by this time 是什么意思
在by this time,a Lancaster bomber in reasonable condition was rare and worth rescuing.中,by this time是什么意思?by this time 还有什么意思吗?
over the years是什么意思?

到目前为止,一个状态良好的Lancaster Bomber为数很少,值得抢救（救助).因为没有上下文只能大概翻译.
by this time,到目前为止（不一定指现在,要看上下文）
over the years：历经数年

this time by this This time,cherish是什么意思 as time went by是什么意思 by this time、by that time、at this（that?） time、since then 的区别 1.By this time tomorrow,they________the play. By this time tomorrow we___this machine, this is our time是什么意思 cut this time down是什么意思 By this time next week we shall be in china.(对By this time n by this time next year he___from this college by sb's time是什么意思啊? title %date% %time:~,8% by escortmnm是什么意思?