upper surface

基本解释

The ink was kept deliberately thin and exposed to air at a precisely controlled temperature, which concentrated the gold particles at the curved upper surface of the fluid.
我们故意把这种墨水保持低浓度，并把它置于精确控制的温度下外露于空气中，这样流体上表面破浪地方的黄金颗粒就能得到浓缩。
And a red surface, stretched between the sweep of the fender and the upper surface of the front-end and then curved backwards to run out well below the middle part of the bonnet.
和一个红色的表面上，伸展之间打扫的挡泥板和上表面的前端，然后向后弯曲，以一发不可收拾，远低于中的一部分，该帽。
The top layer or course of a masonry wall, usually having a slanting upper surface to shed water; a cope.
墙压顶砖瓦墙的顶层或顶部结构，通常有倾斜的上表面以便排水；斗篷状覆盖物。

One day, they found an irregularly shaped stone, about the size of a tea tray, its upper surface pitted with small hemispherical holes.
NEWYORKER: The Sanctuary
Beachface: upper surface of the beach.
UNESCO: L O S S A R Y
Independent Daytime Running Lights (DRLs) are fully integrated into the upper bumper surface to complete this unique new design.
ENGADGET: Lexus LF-CC Concept shows the future of touchscreen interiors