英汉词典

1. 不透明的;不透光的
    If an object or substance is opaque, you cannot see through it.

    e.g. You can always use opaque glass if you need to block a street view.
           如果不想从室内看到街景，可以使用不透明玻璃。

2. 费解的；难懂的；晦涩的
    If you say that something is opaque, you mean that it is difficult to understand.

    e.g. ...the opaque language of the inspector's reports.
           巡视员报告中晦涩难懂的语言