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useless 无用的，没有价值的 user 用户，使用者 usual 通常的，平常的 usually 通常 utility 效用，实用 utilise 实用 utilize 利用 utmost 极度的，极端的，极限 utter 完全的，彻底的说 vacant 空闲的，空缺的

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maintenance inflict identification unemployment intensify decay idiom outbreak idleness beam overwhelming shipwreck graphite thrifty preset misfortune untie compression immortal weary roam transplant impartial vocal

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1849 、 静摩擦 staticfriction 1850 、 颈轴承 journalbearing 1851 、 颈缩 necking 1852 、 频带宽度 bandwidth 1853 、 频率 frequency 1854 、 头座 headstock 1855 、 阈值；临界值

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The Salinity of Ocean Waters If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic s

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I know not that any other author has hinted of the matter; 我不知道是否有其他作家提及此事， but by inference it seems to me that the sturgeon must be divided in the same way as the whale, 不过据我推断，鲟鱼也一定是按大鲸

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He was going on with some wild reminiscences about his tomahawk-pipe which, it seemed, had in its two uses both brained his foes and soothed his soul, 他是在对他那烟斗斧发狂思,那东西,在我们直接注意这个熟睡的索匠的时候,好