smoothest
adj.
平稳的( smooth的最高级 );
光滑的;
磨平的;
（言谈）流利的;
例句:
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Perhaps this is the smoothest and steadiest sleep in this unfamiliar city.
也许,这是他们在这个陌生的城市睡的最安稳的一次.
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He was the smoothest and probably the most powerful chief of staff in political memory.
在人们关于政治人物的记忆里，他是最精明、可能也是最有权势的参谋长。
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Arnold was the whitest and the smoothest man.
阿诺德可是个最纯净--最有礼的人.
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Tunisia seems to be having the smoothest transition.
来自VOA
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This summer, the cities of Beijing and Shanghai will be linked by possibly the smoothest and fastest railway line on this planet.
来自THETIMES