Group (2) - Spelling Practices

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(1) n. Syn. deterioration; decay(衰退,下降,减退) change toward something smaller or lower ; gradual falling off from a better state
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(2) v. Syn. decay(分解,(使)腐烂) decay
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(3) n. (存款人) a person who has deposited money in a bank or similar institution 
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(4) n. (二氧化物) an oxide containing two atoms of oxygen in the molecule
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(5) a. Syn. irregular; odd; whimsical; bizarre(古怪的,奇怪的) departing from a recognized, conventional, or established norm or pattern
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(6) n. (精英,杰出人物) a group or class of persons enjoying superior intellectual or social or economic status 
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(7) n. (雇主,老板) a person or firm that employs workers
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(8) a. Syn. attractive(有魅力的,有吸引力的) charming; tending to draw attention or affections
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(9) n. (消失,灭绝) death of all its remaining members
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(10) n. (促进,帮助) act of assisting or making easier the progress or improvement of something