| 1. | Ab extends by 2mm and bc contracts by 2mm .
AB伸长2mm，而BC缩短2mm。
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| 2. | Soldiers of bad character were branded bc .
对品质恶劣的军人烙BC型烙印。
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| 3. | Glass-making flourished as early as 1350 bc .
早在公元前一千三百五十年，玻璃制造业已十分发达。
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| 4. | The tube abc shown is cantilevered with ab and bc in a horizontal plan .
所示的管ABC是由位于同一水平面内的AB和BC组成的悬臂。
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| 5. | the vertical displacement =1mm is normal to the bars ab and bc and hence does not affect their length.
竖向位移1mm垂直于AB和BC，故不影响它们的长度。
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| 6. | The temple which the archaeologists explored was used as a place of worship from the fifteenth century bc . until roman times .
考古学家们所考察的这座古庙，从公元前十五世纪一直到罗马时代都被用作做礼拜的场所。
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| 7. | After all these concepts go back to 400 bc
毕竟那都是些公元前400年前的概念了。
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| 8. | The scene is laid in athens , in the third century bc
背景是纪元前3世纪的雅典。
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| 9. | Invaded the city of jerusalem right about 9880 bc ,
于公元前980年侵略了耶路撒冷
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| 10. | The first olympic games took place in 776 bc
第一次奥运会于公元前776年举行,
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