A value of 1.0 is completely opaque and a value of 0.0 is transparent.

值1.0完全不透明，值0.0则为透明。

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The more concentrated and opaque a wine's color, the higher its intensity.

葡萄酒颜色越浓缩和不透明，强度就越高。

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You can always use opaque glass if you need to block a street view.

如果你需要挡住外面的街景，你随时可以使用不透明玻璃。

《柯林斯英汉双解大词典》

On the other hand, there are very few safeguards for backers, and accountability remains buried behind however opaque a wall each project wants to put up.

FORBES: Publishers Wanted Obsidian To Use Kickstarter

How did Stanford attract so many despite being a complex, opaque operation in a lightly regulated jurisdiction, offering oddly stable returns?

ECONOMIST: Financial fraud

The answer seems pretty easy, if not opaque to a political class that has seemingly forgotten how economies grow.

FORBES: A Proud Russian Immigrant Reminds Me Of America's Genius