All trace of his working - class background was deliberately obscured.他 工人阶级 出身的所有痕迹都给有意地隐藏起来了.Heavy mists hung in the valley and obscured the mountains.蒙蒙雾霭笼罩着山谷,遮掩了群山.Her poor English obscured her meaning.她的英语差,难以表达自己的...
根和根冠被一鞘 状 结构,即胚根鞘所覆盖.Both root and root cap are covered by a sheath - like structure called the coleorhiza.用来保护发育的胚芽的鞘状的结构.Coleoptile A sheath like structure that protects the developing plumule in grasses.胚根鞘:保护幼根的鞘状结构....