Group (U V W Y Z) - Spelling Practices

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(1) a. Syn. submarine; submerged(在水下的,在水中的) submarine; beneath the surface of the water
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(2) a. Syn. alone; single; sole(独一无二的) without an equal; being the only one of its kind
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(3) v. Syn. unwrap; unfold(打开包裹(或行李),卸货) unwrap; unfold; remove the contents of
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(4) a. Syn. selfless; self-forgetting(不自私的,慷慨的) selfless; self-forgetting; generous or altruistic
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(5) v. (更新,新信息) supply with recent information; bring up to date; bring to the latest state of technology
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(6) n. (真空) empty area or space; electrical home appliance that cleans by suction
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(7) n. (活门,阀) device or structure for controlling the flow of a fluid 
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(8) n. Syn. watchfulness; alertness; caution(警惕) watchfulness; wakefulness; process of paying close and continuous attention
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(9) a. (看得见的,可见的) being often in public eye; obvious to the eye 
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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