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

药的恶臭硝烟笼罩着山谷。”

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.

因为柯达火药在较高的压力下较高的速度燃烧，所必须使一个溢流阀，便少时，能让所产生的部分体排到大中去。