tallest
['tɔ:lɪst]
adj.
高的( tall的最高级 );
难以置信的;
难以完成的;
（用以表示或询问高度）有…高;
例句:
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The tallest pillar is about four light years long.
来自BBC
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Its tallest volcano, long extinct, is Olympus Mons.
它最高的火山是早已熄灭的奥林波斯山。
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The company won a prestigious contract for work on Europe's tallest building.
这家公司赢得了一份极为重要的合同，参与建设欧洲最高的大厦。
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She is the tallest amongst her classmates.
她在她同学之中是最高的.
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Tallest building in the world, the Burj Khalifa.
来自SA
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In Nepal, the tallest of all the grasses grow.
来自BBC