a. not transmitting or reflecting light or radiant energy; impenetrable to sight
s. not clearly understood or expressed
n. 不透明物
a. 不透明的, 不传热的, 不传导的, 阴暗的
[计] 白底
1. The window is opaque, so we can't see outside.
窗户是不透明的，所以我们看不到外面。
2. She chose an opaque color for her paint, which makes the walls look nice.
她选择了一种不透明的颜色来涂墙，这样墙看起来很好。
3. The instructions were written in an opaque way, making them hard to understand.
说明书的写法很不清晰，导致很难理解。