Calcium cyanamide is poisonous and irritating to the skin.氰氨化钙是毒性物质,对皮肤有刺激性.A new process, urea - calcium cyanamide method, for producing thiourea from urea and hydrogen sulfide is proposed.利用尿素和硫化氢等原料制备硫脲, 提出了尿素 - 氰氨化钙法...
He gave me a little peck on the cheek.他匆匆轻吻了一下我的脸。They turn on their own kind and peck each other to death.它们开始攻击同类,拼命地互相啄着。These birds peck off all the red flowers.这些鸟啄掉了所有红色的花。...
降低贸易壁垒导致出口商各自为政。The lowering of trade barriers has led to a free-for-all among exporters.关税和税收是自由贸易的最大壁垒。Duties and taxes are the most obvious barrier to free trade.精神上、地理上的壁垒都在热切的探索者面前退缩.Mental as well as geographical h...