The voice became flat and without tone.

声音变得平淡无味。

But once you do foundation, your face just becomes flat and so you need to bring back the shape in your face.

但是一旦你做了粉底，你的脸就变得扁平了，所以你需要恢复你的脸型。

The scrannel pipes of those who have worn themselves out by their moral fastings, till they have become flat and pale like starved vermin infesting a long-deserted bed, will never reach my ear.

那些因道德禁食而疲惫不堪的人，他们的喉咙变得扁平苍白，就像饥饿的害虫在长期荒废的床上出没，永远不会传到我的耳朵里。