1. Thirteen is not divisible by any even number.
   13不能被任何偶数除尽。
2. Many people think thirteen is an evil number.
   很多人认为十三是个不吉利的数字。
3. Peter has done thirteen years in the RAF.
   彼得已经在英国皇家空军度过了13年。
4. Thirteen is not divisible by any even number. 13
   不能被任何偶数除尽。
5. Why could Xuanzang be tonsured when he was thirteen years old?
   13岁的少年玄奘为什么能够破格剃度？
6. Thirteen is an unpropitious number.
   13是个不吉利的数字。
7. Thirteen new compounds of the alkyl styryl indoline spirobenzopyrans were synthesized from the condensation of 2-methylene indoline with the designed salicylaldehyde.
   利用2-亚甲基吲哚啉和取代水杨醛缩合得到十三种新的烷基苯乙烯基吲哚啉螺苯并吡喃。
8. Approximately thirteen seconds before impact, the Copperhead's laser light sensor becomes active, and it uses fins to guide itself to the laser light source.
   在炮弹着地前大约13秒时铜斑蛇的激光传感器启动，利用直尾翅制导攻击激光照射目标。
9. In chapter thirteen, Aristotle outlines an ideal of the central character of tragedy, the so-called tragic hero, and identifies the source of the character's downfall with something called hamartia.
   在第十三章，亚里斯多德描画了一个悲剧中心角色--悲剧主人公的理想，并指出该角色的堕落是因为一种叫“悲剧性缺陷”（hamartia）的东西。

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