as against (=in contrast with) 与……相对照。例如：1) She gets Saturdays off in her new job as against working alternate weekends in her last one. (她新找的这份工作星期六放假，而原来的那份工作周末是隔周放假。) 2) The business done this year amounts to $20,000 as against $ 15,000 last year.
as of (=as from) 从……起。例如：1) You are in charge (负责) as of today. 2) The agreement starts as from March 13.
as for至于。例如：1) As for me, I shall return there on arrival. 2) As for me, I'm in favor of the first view.
as to关于;至于。例如：He asked my advice as to what to do next.
as with与 ……一样。例如：As with so many of the major problems of society, the precise extent and nature of the environmental crisis are not entirely clear.
as regards至于。例如：There are no special rules as regards what clothes you should wear. (至于应该穿什么衣服没有硬性规定。)
as follows如下。例如：1) The reasons are as follows. 2) The report reads as follows.
may(might , could) as well do sth. 不妨，最好(做某事)。例如：Since it is too late, we might as well go back home.
as it were可以说，姑且这么说。例如：He is, as it were, a walking dictionary. (他，可以说，是一部活词典。)
as opposed to和 ……相反。例如：John likes rice, as opposed to Mary, who hates it.
as yet到这时为止(还没有)：But none of these are as yet carefully thought-out plans.
as soon as possible尽快地。例如：We should take steps as soon as possible.
as a rule通常。例如：1) As a rule they sat together very quietly. 2) His writing as a rule is elegant.
such … as to这样 …… 以致。例如：I went about my job in such a way as to try to kill two birds with one stone.
not so much …as与其说……，倒不如说…… ：The trumpet player was certainly loud. But I wasn't bothered by his loudness so much as by his lack of talent. (这个吹号手的声音确实很大，但我烦的与其说是他吹得太响，倒不如说是他缺乏天分。)
such as例如：Studies show that the things that contribute most to a sense of happiness cannot be bought with money, such as a good family life, friendship and work satisfaction. (研究表明，那些最能使人产生幸福感的东西是不能用金钱买到的，如和睦的家庭生活、友谊和事业上的满足感。)
Just as … so …正如 …… 一样，……也……。例如：Just as air is important to man, so is water to fish.
as long as (=so long as)只要(引导条件从句)：As long as he works hard, I don’t mind when he finishes the experiment.
as though (=as if ) 似乎。例如：Christie stared angrily at her boss and turned away, as though to go out of the office.
much as虽然。例如：Much as I admired David as a poet, I don't like him as a man. (虽然我仰慕作为诗人的大卫，但我不喜欢他的为人。)
as…as引出比较状语从句：Americans eat twice as much protein as they actually need every day. (美国人摄取的蛋白质是他们实际需要量的两倍。)
As is often the case事情常常是这样：As is often the case, it happened so gradually that it was barely perceptible.
as 虽然 (引导部分倒装的让步从句)：Young as he is, he knows a lot. (他虽年轻，但很懂事。)
as作关系代词，引导定语从句，代表整个主句的意思：1)A good many proposals were raised by the delegates, as was to be expected . (正如所料，代表们提出了许多建议。) 2) As might be expected, the response to the question was mixed. (正如所料，人们对这个问题观点不一。)
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