他以严厉的眼光吓他们,活象兽群中间的驯兽师.He cowed them with his hard eyes like a tamer among beasts.他是马戏团的驯兽师.He is an animal trainer for the circus.我接受了驯兽师的座右铭: “ 这决不是动物的错. ”I adopted the trainers'motto " It's never the animal s...
他采集了各种岩石和矿物的样品.He collected specimens of all kinds of rocks and minerals.硅酸盐矿物的特点是耐熔和难以分离.Silicate minerals are characteristically refractory and difficult to break down.此硬度计的依据是矿物的相对研磨能力.This scale is based on the relat...