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at one time [ once ] 一度；曾經；在過去

     Material made from silk was at one time very expensive.

        絲做成的質料一度曾經非常昂貴。

     People who at one time could barely run a few yards to catch their morning

     buses are now jogging.

        以往一度僅能勉強跑幾碼路以趕早上公車的人們，現在卻在慢跑了。

    . material [mD}t0r0Dl ] n. 材料；原料     yard [jArd ] n. 碼  

     jog [dIAg] v. 慢跑；徐行

   at one’s mercy── at the mercy of [ in the power of; subject to the will and wishes of ] 任人處置、控制、擺佈

     The big boy had his little brother at his mercy.

        這大男孩置其小弟在其宰制下。

     The poor people were at the mercy of the storm.

        這些可憐的人任由暴風雨擺佈。

     Workers are entirely at the mercy of dishonest employers.

    .mercy [}m"si] n. 仁慈；憐憫  

     subject [}sKbdI0kt] adj. 1. 從屬的；受支配的 2. 易受------的

* at present [ now; at this point in time ] 現在；目前

     We may be able to lend you money next week, but not at present.

        我們下週也許能借你錢，但不是現在。

     We don’t need any more at present.

        目前我們不須要再多些什麼。

At present, he is not at home.

at random [ without sequence or order ] 隨意地；漫無目的地

     She asked questions at random.

        她隨便問些問題。

     Bill read a detective story at random.

        比爾隨意地讀一本偵探小說。

     The terrorists fired into the crowd at random.

     Names were chosen at random from a list.

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