And so designers have become very adept at creating interfaces that allow you to manipulate parameters while you're attending to other things, such as taking a photograph and changing the focus or the aperture.
因此当今设计师们致力于 开发一些交互方式， 使你在做一件事的同时 还能调整其他功能， 比如你在照相的同时 还可以调整焦距 或调整光圈。