The " bread" of this butty is a pair of layers, top and bottom, of titanium dioxide, each three nanometres thick.

三明治两片“面包”化钛，上下各有一层，每层有三纳米厚。

The only thing that comes to mind is a chip butty, which is a sandwich made with fries inside and guess what?

唯一想到片三明治，这一种里面有三明治，你猜怎么着？

In the Midlands, it would be a bap, or we'd probably call it a roll. - A roll. A barm. A butty. - A cob.

在英格兰中部中，它会叫做软面包，或者我们可能会叫它小圆面包。- 小圆面包。酵母面包。三明治面包。- 圆面包。