The difference is purely aesthetic.

　　差異純粹是審美的。

　　Lather, however, is purely aesthetic.

　　然而，泡沫僅僅是審美上的需要。

　　The pole was removed to make it more aesthetic.

　　為使畫面更具美感，左圖中的網(wǎng)柱被移除了。