In this paper, a discrete stage - structured epidemical model is proposed and studied.本文主要讨论了离散的阶段结构传染病模型.OBJECTIVE To explore the administration measures of air condition usage in SARS epidemical period.目的研究传染性非典型肺炎流行期间...
Your dad and Admiral Spruance are rounding the Smiths'terrace.你爹跟期普鲁恩斯少将绕过坡上史密斯家的房屋来了.He had sought work as a cowboy, rounding up cattle.他找了一份放牛的差事,负责把牛赶到一起。After rounding Cape Finisterre the boats ride the north-ea...