Group (U V W Y Z) - Spelling Practices

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(1) a. Syn. supersonic(超音速的,超声(波)的) supersonic; higher in frequency than the range of sound perceptible to the human ear
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(2) v. Syn. weaken(破坏) weaken by wearing away base or foundation; injure or impair; dig a mine or tunnel beneath
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(3) v. (摆脱…的负担,卸) take something off a container
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(4) a. (笔直的,直立的,柱子,直立物) in an erect position or posture; perpendicular; vertical, or nearly vertical; pointing upward
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(5) n. Syn. exigency; emergency(紧急情况) emergency; pressing importance; need; pressing necessity
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(6) n. Syn. outlet(出口,出路) small opening; means of escape or release; outlet; hole for the escape of gas or air
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(7) a. Syn. feasible; practicable(能养活的,可行的) practical or workable; capable of maintaining life; capable of continuing effectiveness
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(8) a. Syn. turbulent(暴力引起的,暴烈的) turbulent; intensely vivid or loud; by violence or bloodshed
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(9) n. (小提琴,小提琴手) small instrument with four strings, played with a bow; a fiddle
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(10) v. (使显现,使形象化) make visual, or visible; see in fancy; form a mental image of