He has a black heart.

他是个黑心肠的人。

Better a red face than a black heart…

宁可脸红，不可心黑。

Judge is the black heart bucket: barrels of transparency is low, for a long time after use will be grayed dark.

判断黑心桶的方法是：桶透明度低，长时间使用后会变灰变暗。

More likely, in his black heart, he simply regrets not having had the imagination and cojones to work those shell-game maneuvers back when he was on top.

很可能在黑暗的内心深处，他只是遗憾自己身处高位时没有机智和胆量多耍些骗人的把戏。但他并没有丧失自己的才能。