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关于，至于；就……而言
1、hundreds of thousands of───几十万；无数；几十万，无数
2、hundreds of billions of───千亿
3、of───prep.属于；……的；……的一部分；住在（某地）；关于；由……组成的；因为；（表示人或事的时空位置）在，当；prep.关于; 属于…的; 由…制成
4、of.───abbr.外场（outfield）；边境
5、hundreds of millions of───数以亿计的；亿万
6、of the order of───大约，与…相似；大约；达到…的程度
7、f of of───第页，共页
8、tens of thousands of───成千上万；数以万计；千百万; 千千万万; 成千上万
9、of of───的
1、Apropos of higher tuition, Mr Black told the boy about the educational loans that banks are offering.───关于学费昂贵的问题，布雷克先生告诉学生那银行可提供教育贷款。
2、Apropos of that quagmire, you're a hearty animal. Why didn't you toss the man in there?───说起洼地来，你真是一个古怪的家伙，为什么你不把这个人丢进去？
3、She was no longer sure of her position. Apropos of that, it was clearly time for more persuasion.───她对自己的立场不再胸有成竹。谈及此，显然正是做更多说服工作的时候。
4、'Oh, all right, ' said Joe suddenly, apropos of nothing. 'I'll get a move on. '───“对了，我起来活动活动。”乔突然说了句屁话。
5、They go off to a place to dream , dreaming because of and apropos of the music yet never quite listening to it .───他们到另一个所在去梦想，他们由于有了音乐而梦想，关于音乐的梦想，但却从来不真正在听音乐。
6、The story was introduced apropos of nothing.───这一报道是凭空编造来的。
7、Now and then, apropos of nothing save her own mood, Mrs. Bracebridge would indicate her philosophy of life in an epigram.───联桥夫人不时谈及自己的性情，总用一句警句指出她的人生哲学。
8、Apropos of closing night, we almost had a crisis.───演出的最后一晚，我们几乎遭遇到一场危机。
1、He had nothing to say apropos of the latest developments.
2、Mr Green went to see Mr White apropos of buying a house.