twain
[tweɪn]
n.
二;
一对;
（二者）水火不相容;
永远不可能合到一起;
adj.
二的，一对的;
例句:
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Elmira College is a major center of Twain scholarship.
来自SA
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Five loaves hath he, And fishes twain.
来自J. Keble
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Mark Twain accused Brigham Young of ordering the killings.
来自NEWYORKER
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Mark Twain is a pseudonymity for Samuel Langhorne Clemens.
马克·吐温是萨缪尔·兰亨·克里曼斯的笔名.
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East is East, and West is West, and never the twain shall meet.
东是东, 西是西, 故而两者永远不相遇.
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To my mind, Mark Twain was beyond question the large man of his time.
在我看来, 马克·吐温无疑是他那一时代中了不起的人物.