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。”

Since cordite burns at a greater rate at a higher pressure a relief valve must be used to allow generated gas to escape to atmosphere at times when the demand is low.

因为药在较高的压力下较高的速度燃烧，所使用一个溢流阀，便当用气少时，能让所产生的部分气体排到大气中去。