The stench of cordite and clouds of smoke hung over the hollow.

炸药的恶臭和爆炸硝烟笼罩着山谷。”

Magnesium Hydroxide flame retardment has some characteristics of retarding fire,reducing smoke,cheap priceand safe stuff etc,therefore,it is applied widely.

氢氧化镁阻燃剂具有阻燃、硝烟、填充安全、价格低等特岙被泛开研究。