1. 污染：表面处理后的底层冠不能直接手摸以免污染(contaminating)瓷覆盖面,应用针持夹持. ② 不透明瓷粉的及烧结(opaque firing):先在底层冠的瓷覆盖区涂布薄层的不透明瓷粉专用液(mixing liquid). 取适量不透明瓷粉在玻板上与专用液调合,

adj

1. spreading pollution or contamination
especially radioactive contamination

e.g. the air near the foundry was always dirty
a dirty bomb releases enormous amounts of long-lived radioactive fallout

Synonym: dirty

2. that infects or taints

Synonym: corrupting