The market is becoming brisker day by day.市场日趋繁荣.Competition on the restaurant scene however is a lot brisker.然而,餐馆里的竞争是激烈的.From 1957 to 1962, symphonic creation became even brisker.1957年一1962年间, 交响音乐创作呈现出更为活跃的局面....
卵子排出后可存活12至36小时。Once the ovum is released it has a lifespan of 12 to 36 hours.在同一发情期排出两个或数个卵子.Two or more ova are shed during the same heat period.到第11天卵子着床嵌入子宫内壁.By day 11 the ovum begins to attach and implant in the li...