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国际航空
| 地球物理
| 安全
| 协会
| 国际航空 | |
| interntl.trade. | international air mail |
| 地球物理 | |
| chem. | geophysics |
| dril. | geoph; geophs |
| eng.geol. | physics of the Earth |
| 安全 | |
| dat.proc. | system security |
| environ. | safety |
| hydroel.st. | security; safety |
| 协会 | |
| tech. | Association |
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| international air mail | |||
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国际航空 : 220 phrases in 24 subjects |
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