下面这两个副词均含"……以前"的含义： ago ：指从现在起往前推算一段时间，始终置于所修饰的词之后，与一般过去时连用。 before ：或指从过去某一时间起向前推算的若干时间的以前，通常与过去完成时连用；或泛指以前，并不具体指若干时间以前，可使用现在完成的或过去时；还可指从将来某一时间起的若干时间以前。
Mechanization happened years ago on the farms of Islay.数年前，艾莱的农场就实现了机械化。Rationing had put an end to a surfeit of biscuits long ago.定量供应很久以前就结束了饼干过剩的状况。Their water was turned off weeks ago without explanation.他们的水在几周以前就毫无...
A hundred years ago coronary heart disease was virtually unknown in Europe and America.在100年前冠心病几乎不存在于欧洲和美洲。Cato , an influential Roman thinker, 000 years ago, praised its medical value.CatotheElder是两千年前一位古罗马很具影响力的思想家, 以...
The spear is presumably the murder weapon...这支鱼叉可能就是凶器。Presumably this is where the accident happened.这大概就是事故现场。The filigree, presumably by virtue of these fields, completely alters the structure of the granulation.大概是由于...
本文介绍了羟乙基纤维素的一般性质, 应用和生产方法.The general properties, application and manufacturing methods of HEC were introduced.研究了高取代度羟乙基纤维素 ( H-HEC ) 的精制工艺.The refining process of high - substitution hydroxyethyl cellulose ( H - HEC ) ...
Salesmen of unofficial souvenirs have also been doing a roaring trade.出售非官方纪念品的推销员的生意也很红火。Unofficial estimates put the figure at over two million.非官方的估计数字为200万以上。In July he issued a decree ordering all unofficial armed g...