目前，30%的爬行动物、鸟类和鱼类面临灭绝的危险。30 percent of reptiles, birds, and fish are currently threatened with extinction.牛奶、油性鱼类和鸡蛋都含有维生素D.Milk, oily fish and egg all contain vitamin D.彼得·福雷是自然历史博物馆鱼类化石展厅的负责人。Peter Forey is curator of ...
总被人嘲笑是很让人灰心的.It is very discouraging to be sneered at all the time.他们不得不与高涨的物价作长期而灰心的斗争.They have had to wage a continual despairing fight against the rise of prices.使整个队感到灰心的失败.A failure that dispirited the team....
Thus only the metabolizable portions of a feedstuff can provide energy and essential nutrients.因此,只有饲料的可代谢部分可提供能量和必需的养分.Flours contain very small amounts of sugars which are metabolizable by yeast.面粉中一般都含有少量的糖,它们是酵母的代谢产生...
特迪咂了咂舌头，活像个不以为然的英国女舍监。Teddy clucked his tongue like a disapproving English matron.他伸出舌头，鼻翼扇动着。He stuck out his tongue and flared his nostrils.我走到镜子前面伸出舌头。I walked over to the mirror and stuck my tongue out....
在它的介体中是属于中间的或半持久的.That is transitory or semipersistent in its vector.植物有充分的变异性可用于培育对一些蚜虫介体的抗性.There is adequate variability in plants to breed for resistance to certain aphid vectors.吸收养分的介体.Helps in the absorption of nu...