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| aboriginal | 
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| a. Syn. primitive; native (原來的,土著的) being the first of its kind in a region; primitive; native | 
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| abort | 
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| v. Syn. failure; terminate (中止計劃(任務)) stop; terminate before completion; terminate a pregnancy | 
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| abridge | 
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| v. Syn. condense; shorten (刪節,節選) condense; shorten; reduce length of written text | 
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| abrupt | 
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| a. Syn. sudden; unforeseen (突然的,意外的) broken off; very steep; having sudden transitions from one subject to another | 
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| absorb | 
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| v. Syn. monopolize; receive (吸收,合併) assimilate or incorporate; suck or drink up; occupy full attention | 
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| abstract | 
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| a. Syn. theoretical; abstruse (抽象的) theoretical; not concrete; not applied or practical; difficult to understand | 
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| abundance | 
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| n. Syn. profusion; richness (豐富,充裕) great or plentiful amount; fullness to overflowing | 
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| accelerate | 
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| v. Syn. speed; hasten (加速) move faster; cause to develop or progress more quickly; occur sooner than expected | 
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| accessory | 
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| n. Syn. adjunct; appendage (附件) additional object; useful but not essential thing; subordinate or supplementary item | 
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| accommodate | 
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| v. Syn. adapt; oblige (招待,食宿,適應) do a favor or service for; provide for; supply with; make suitable; adapt; allow for | 
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| accommodation | 
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| n.  (住處,住所,適應,調節,通融) living quarters provided for public convenience; something that meets a need; convenience |