所有科技知识-科学时代

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

periodic table of elements	periodic tenancy	periodic trajectory	periodic undulation	periodic unsteady flow
periodic variable	periodic vibration	periodic vibration	periodic working	period infant mortality
period instrument	period inventory	periodization	periodize	period life table
period life table	period life table analysis	period-luminosity relation	period measure	period meter
period meter	period mortality	period mortality	period of absence	period of acceleration
period of amortization	period of a state	period of benefit	period of benefit	period of cancellation
period of concentration	period of contract	period of contract	period of cost recovery	period of cost recovery
period of credit	Period of Decline	period of decline	period of demographic transition	period of dependency
period of depreciation	period of elongation	period of enlightenment	period of enlightenment	period of execution
period of fecundity	period of gestation	period of gestation	period of grace	period of grace
period of grace	period of grace	period of grace	period of heading	period of incubation
period of incubation	period of insurance	period of light variation	period of limitation	period of limitation
period of limitation for freight claims	period of limitation for passenger claims	period of loan	period of moon's node	period of notice
period of notice of termination of service	period of observation	period of operating cycle	Period of Orthodoxy	period of oscillation
period of oscillation	period of planting	period of prescription	period of proliferation	period of pseudo-random numbers
period of puberty	period of qualifying service	period of redemption	period of reinsurance	period of responsibility
period of revolution	period of revolution	period of revolution	period of rise	Period of Scholasticism
period of service	period of sexual maturity	period of shipment	period of slack sales	period of stagnation
period of validity	period of validity	period of validity	period of virescence appreciation	period of wave
period of wave hindcasting	periodogram	periodogram	periodontics	periodontitis
periodontium	periodontosis	period order quantity	period parallelogram	period performance
period per second	period per second--period per second (pps)	period per second (pps)	period play	period prevalence
period-radius relation	period repair	period reproduction rate	period reproduction rate	period shutdown
period silhouette	period spectrum	period-spectrum relation	period table	period table
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