氰氨化钙是毒性物质,对皮肤有刺激性.Calcium cyanamide is poisonous and irritating to the skin.叠氨化银不溶于水或硝酸.Silver azide does not dissolve in water or in nitric acid.氨化作用、同化作用及滤池的硝化作用是氮的主要转化形式.Ammonification, nitrification and nitrogen assi...
It inculcated universal asceticism and social levelling in its crudest form.这种文献倡导普遍的禁欲主义和粗陋的平均主义.At the crudest level, prices provide an incentive for production.从最基本的层次来说, 价格刺激生产.At its crudest, talk of " reciprocity "...
伴随着隆隆的低沉噪声，螺旋桨开始旋转起来。With a low-pitched rumbling noise, the propeller began to rotate.头顶上，直升机在呼啸，巨大的螺旋桨叶片搅动着空气。Overhead, the chopper roared and the big blades churned the air.发动机使螺旋桨旋转起来。The engine turned a propeller....