| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
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| TD | the time required to double the number of cells in a given population; thermal death time |
| UNFPA | United Nations Population Fund |
| ZPG | zero population growth |
| IMR | Infant Mortality Rate; ¿µ¾Æ »ç¸Á·ü |
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