Group (N O) - Spelling Practices

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(1) n. (麻醉的,催眠的) addictive drug, such as opium, that reduces pain, alters mood and behavior; inducing sleep
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(2) n. (氮) colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume
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(3) a. Syn. invalid; void; nullified(无效的,无价值的,等于零的) invalid; void; nullified; having no legal force; invalid
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(4) a. Syn. insensible; indifferent(麻木的,使失去感觉) without the power of sensation and motion or feeling; insensible; unresponsive; indifferent
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(5) a. (长方形的) having greater length than breadth, especially when rectangular
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(6) 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
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(7) v. Syn. bypass; neglect(省略,省去,忽略) leave undone or leave out ; bypass; neglect; fail to include or mention
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(8) n. Syn. antagonist; adversary(对手,反对者) contestant; someone who offers opposition ; adverse; hostile; opposing
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(9) a. (视觉的,光学的) of or relating to or involving light or optics
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(10) a. (可选的) not obligatory; left to choice; not compulsory or automatic