adj.不透明的；难懂的
The window is made of opaque glass. 这扇窗是用不透明的玻璃做的。
The report was written in long, opaque sentences. 报告中的句子又长又难懂。
Their intentions remained opaque. 他们的意图仍然令人费解。
n.不透明性；蔽光性
