Group (U V W Y Z) - Spelling Practices

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(1) a. (紫外线的) wave lengths shorter than light but longer than X rays
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(2) a. (没有说出的,数不清的) not told; not related; not revealed
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(3) n. (真空) empty area or space; electrical home appliance that cleans by suction
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(4) n. (活门,阀) device or structure for controlling the flow of a fluid 
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(5) v. (改变,变化) change aspect of; alter in form, appearance, substance, position; make different by a partial change; modify
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(6) n. Syn. plants(植物,草木,植被) plants of an area or a region; plant life
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(7) a. (熟练的,精通的) acquainted through study or experience; knowledgeable or skilled
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(8) v. (颤动,震动) shake, quiver; move or swing from side to side regularly
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(9) n. (时尚) popular fashion; current state or style of general acceptance and use
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(10) a. Syn. changeable; explosive; fickle(挥发的,飞行的,可变的,爆炸的) tending to vary often or widely, as in price; inconstant or fickle; tending to violence