名詞 surface area:

1. the extent of a 2-dimensional surface enclosed within a boundary
   同義詞：area, expanse

1. The hard outer portion or surface area of bread.
   面包皮面包的表面區(qū)域的硬皮
2. In printing, the surface area taken up by type of a given size. Thus an8 point type occupies a print area of8 point em.
   在印刷技術中，給定尺寸的鉛字所占有的表面積。這樣，一個8點的鉛字則占有8點em的印刷面積。