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，材料，易磨损，文件具隐密。

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

量度纸张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.

它仅因为虚拟数的间接调用降低了程序的速度，它还是一堵的墙，元编程无法穿过它。