21. odd a.[ɒd] 奇特的,古怪的;奇数的
例句:It's very odd that she didn't reply to our letter.
她没有回我们的信是件很奇怪的事。
例句:1,3, 5 and 7 are odd numbers.
1,3, 5 和7 是奇数。
22. omit vt.[ə(ʊ)'mɪt] 省略
例句:In writing telegrams omit superfluous words.
写电报稿要省去不必要的文字。
23. opponent n. [ə'pəʊnənt]敌手,对手
例句:He was assailed by his political opponent.
他遭到政敌的攻击。
例句:He is slashing wildly at his opponent with a sword.
他正用剑疯狂地朝对手乱砍。
24. opportunity n. [ɒpə'tjuːnɪtɪ] 机会,时机
例句:You must grasp this opportunity.
你必须抓住机会。
例句:The opportunity has not yet arrived.
时机尚未成熟。
25. orchestra n. ['ɔːkɪstrə] 管弦乐队
词义辨析:orchestra, band
orchestra: 指规模大、最为完整的交响乐队,可演奏各种不同音乐,一般由弦乐、木管乐、铜管乐和打击乐所组成。
band: 指主要由铜管乐、木管乐和打击乐所组成的乐队,主要演奏轻音乐和流行乐曲,与orchestra的主区别在于没有弦乐。
例句:The orchestra has several concert engagements.
这管弦乐队已安排好几场音乐会。
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