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- Then he read about research tracing the Y sex chromosome, which is passed intact from father to son, all the way back to the time of Aaron, the single progenitor of the priestly cohen caste 3,000 years ago. 接着他阅读了有关Y性染色体的研究材料。Y染色体完整地从父亲传递给儿子，这就可以一路追溯到圣人艾伦的年代。艾伦是3000年前的教士科恩种姓的惟一祖先。
- The letter was written on a single sheet of paper. 这封信只用一张纸写成。
- One single, second class, to winchester, please. 买一张去温撤斯特单程二等票。
- He got over the stream with a single leap. 他一跃就跳过了小溪。
- The bridge crosses the river in a single span. 河上那座桥是单跨桥。
- Do you want a single or a return ticket? 你要单程票还是往返票?
- Is the material single width or double width? 这幅料子是单幅的还是双幅的？
- I have had to work for every single penny I earned. 我挣的每一便士都是辛苦工作得来的。
- The huntsman fired a single shot at the lion and settled its hash. 猎人朝那只狮子开了一枪，把它打死了。
- Five twenties and ten single, please. 请给我5张20元的和10张1元的。
- She wore a single orchid on her evening dress. 她在晚礼服上缀着一朵兰花。
- Up to yesterday, I thought he was single. 直到昨天，我一直以为他是独身。
- Can you let me have a room with two single bed? 可以给我一间两张单人床的房间吗？
- One of four offspring born in a single birth. 四胞胎之一一胎出生的四个孩子中的一个
- For strong sewing use double, not single thread. 为了缝得牢，用双线，而不要用单线。
- A single grain of a cereal plant. 谷粒禾谷类作物的一个颗粒
- A single room with a bath, if possible. 如果可能，要一间带浴室的单人房。
- Do you want a single room or a double room? 您要单人房还是双人房？
- Producing two offspring in a single birth. 一产双胎的一次生产中生下两个子女
- Delay is not permissible, even for a single day. 不得延误，即使一日亦不可。
