不透明

Totally new tilting-grain board, colorful, nontransparent material, wear-proof, best for file security.

全新斜纹板片，色泽鲜艳，不透明材料，不易磨损，件隐密性。

Opacimeter: Instrument for measuring the opacity of paper and expressed it as a percentage.

量度纸张不透明度并以百分率表示的仪器。

Not only does it slow down the program due to the virtual function indirect call, it is also an opaque wall where no metaprogram can get past.

它不仅因为虚拟数的间接调用降低了程序的速度，它还是一堵不透明的墙，元编程无法它。