Before it reaches the packaging room, as the salt falls through a chute from one conveyor belt to another, a small pump sprays iodine into the grainy white cascade.

• 进入到包装车间之前，盐下落通过一个斜槽，在传送带之间输送的过程中，一个小泵喷洒出颗粒状的白色碘雾。