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A username must be longer then 3 characters and contain only numbers and letters.
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用户名必须大于3个字符，之允许数字和字母。 |
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A usually alcoholic drink taken just before bedtime.
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睡前饮料在睡前饮用的一种饮料，通常含酒精 |
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A usually audible discharge of intestinal gas.
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屁从肠内排出的（通常有声音的）气体 |
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A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.
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黑曜岩火山玻璃，一般为黑色，带状，摔碎时色泽光亮，表面变曲，由火山熔岩迅速凝而成 |
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A usually expansionist national policy having as its sole principle advancement of the national interest.
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现实政治常指一种扩张的国家政策，把国家利益看作是唯一的原则性进展 |
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A usually fatal epidemic disease, especially bubonic plague.
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瘟疫通常指一种致命的传染病，尤指淋巴腺鼠疫 |
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A usually high-speed ski turn used for changing the direction of descent or stopping, performed by shifting the weight forward and turning with the skis kept parallel.
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作制动转弯在转变下滑方向或停止时的高速滑雪旋转，通过向前转移重量并平行地旋转滑雪板来完成 |
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A usually humorous medley.
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幻想曲一段相当幽默的旋律 |
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A usually metal projectile in the shape of a pointed cylinder or a ball that is expelled from a firearm, especially a rifle or a handgun.
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子弹，枪弹从火器中，尤指步枪或手枪中发射出来的金属射弹，形状为尖柱体或球状 |
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A usually open gondola suspended from a hot-air balloon.
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吊篮悬挂在热气球上，通常为敞口的吊篮 |
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A usually round pin that fits tightly into a corresponding hole to fasten or align two adjacent pieces.
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暗榫通常为一圆钉，紧扣在相应的眼里以固定或校正相似的两片 |
