Results In normal fetus, the urorectal septum ( URS ) descended, its distance to cloacal membrane decreased gradually. 结果 泄殖腔发育过程中,胎龄15d前 的正常鼠胚, 尿直肠隔将 泄殖腔 分为腹侧的尿生殖窦和背侧的直肠两部分, 二者共同相通于泄殖腔管.
Materials which have magnetic properties similar to iron are ferromagnetic.具有类似于铁那样的磁性的材料就是铁磁物质.A number of rather exotic ferromagnetic materials have been studied to this end.为此,研究了许多颇为奇特的铁磁材料.It is sometimes difficult ...
内置有断路器，防止设备过载。There is an internal circuit breaker to protect the instrument from overload.断路器一般浸在油罐内.The circuit - breaker is generally immersed in a tank of oil.他们围住了他,非要关掉断路器.They had him surrounded and were determine...
The people at control have already begun to count down.控制站的人员已经开始倒计时了.The spaceship will soon be launched, the people at control have already begun to count down.宇宙飞船很快就要发射了, 控制室的人已经开始在倒数了.The people at Control have alre...