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n.
(麻醉的,催眠的) addictive drug, such as opium, that reduces pain, alters mood and behavior; inducing sleep


Spelling Word: narcotic
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n.
(氮) colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume


Spelling Word: nitrogen
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a. Syn. invalid; void; nullified
(无效的,无价值的,等于零的) invalid; void; nullified; having no legal force; invalid


Spelling Word: null
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a. Syn. insensible; indifferent
(麻木的,使失去感觉) without the power of sensation and motion or feeling; insensible; unresponsive; indifferent


Spelling Word: numb
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a.
(长方形的) having greater length than breadth, especially when rectangular


Spelling Word: oblong
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n.
(天文台,气象台) place or building for making observations on the heavenly bodies; building fitted with instruments for making systematic observations of space


Spelling Word: observatory
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v. Syn. bypass; neglect
(省略,省去,忽略) leave undone or leave out ; bypass; neglect; fail to include or mention


Spelling Word: omit
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n. Syn. antagonist; adversary
(对手,反对者) contestant; someone who offers opposition ; adverse; hostile; opposing


Spelling Word: opponent
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a.
(视觉的,光学的) of or relating to or involving light or optics


Spelling Word: optical
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a.
(可选的) not obligatory; left to choice; not compulsory or automatic


Spelling Word: optional