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...
Gymnastics is a sport that requires a considerable level of coordination.体操是一项需要高协调性的运动.The coordination of adenine substituted to the cental zinc leads to self assembly.结果表明,腺嘌呤取代基与中心金属锌的轴向配位驱动了自组装.The coordination opti...
The highest Order of Knighthood is the Order of the Garter.最高骑士勋位是嘉德勋位。He received a knighthood in the New Year's Honours list.他是新年受勋者之一，荣获爵士称号。Sir Joseph's knighthood was the final feather in his cap after yea...
I've swopped all my marls with the little fellows.我把所有的弹子都换给小家伙们了.The calsilutites and marls are associated with gypsum or contain pseudocrystals of gypsum.泥晶灰岩和泥灰岩常与石膏共生或含有石膏假晶....