1. odd a. 奇特的，古怪的；奇数的
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。
1,3, 5 and 7 are odd numbers.
1,3, 5 和7 是奇数。
2. omit vt. 省略
In writing telegrams omit superfluous words.
写电报稿要省去不必要的文字。
3. opponent n. 敌手，对手
He was assailed by his political opponent.
他遭到政敌的攻击。
He is slashing wildly at his opponent with a sword.
他正用剑疯狂地朝对手乱砍。
4. opportunity n. 机会，时机
You must grasp this opportunity.
你必须抓住机会。
The opportunity has not yet arrived.
时机尚未成熟。
5. orchestra n. 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。
The orchestra has several concert engagements.
这管弦乐队已安排好几场音乐会。
6. semester n. 学期；半年
词义辨析：term, semester
term: term多用于英国。
semester: 主要在美国、德国使用。
This semester will be my last one in this university.
这个学期将是我在这所大学的最后一学期了。
7. semiconductor n. 半导体
This is a semiconductor integrated circuit.
这是一个半导体集成电路。
8. seminar n. 研讨会
The old professor had presided over a seminar for theoretical physicists.
老教授主持了一次理论物理学家的研讨会。
9. terminal a. 末端的，极限的 n. 终点
From the terminal building Keycase returned to the parking lot.
奇开斯从终点大楼回到停车。
I'll keep with you to the bus terminal.
我陪你到公共汽车终点站。
10. territory n. 领土
Angola was once a Portuguese territory.
安哥拉曾经是葡萄牙的领土。
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