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...
Name six perennials and six annuals suitable for indoor flower arrangement.列出多年生及一年生花朵各六种,它们必须是适合插花的.Herbage can be divided into three categories : annuals , biennials, and perennials.草本植物可分成一年生 、 二年生和多年生.Perennials like...
"Ha ha, ho ho," he chortled.“哈哈，呵呵，”他哈哈大笑。Gill chortled with delight.吉尔高兴得哈哈大笑。When I told them what had happened to me, they all chortled with mirth.我把我的事告诉他们以後, 他们咯咯地笑起来了....