Group (U V W Y Z) - Spelling Practices

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(1) v. Syn. undervalue(低估,看轻) make too low an estimate of the quantity; undervalue
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(2) v. Syn. embark; assume(从事,承担) take on; embark on; assume
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(3) ad. Syn. unluckily(不幸地) unluckily; by bad luck
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(4) a. Syn. alone; single; sole(独一无二的) without an equal; being the only one of its kind
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(5) v. Syn. speak; express(做声,发表) speak; express; send forth with the voice
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(6) n. (谷,河谷,流域) space between ranges of mountains; area drained or irrigated by a river system; internal angle formed by intersection
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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. (血管,静脉,木纹,矿脉,岩脉) blood vessel that carries blood
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(9) n. Syn. trace(遗迹,痕迹,残留物) trace; remains; indication that something has been happened
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(10) v. (颤动,震动) shake, quiver; move or swing from side to side regularly