天然水晶内有棉絮、矿质、冰裂、表面凹点、天然轻微破损都属正常现象，不属品质问题。
There are natural cotton crystal, mineral, concave surface, the natural normal function of any minor damage, is not a quality problem.
通过从探测器的舱室中提取水分，探测器表面形成一个凹半球。
By extracting water from the detector's chamber, the detector's surface becomes a concave hemisphere.
弯月面容器中之静止液体的弯曲上表面，如果液体浸润了容器壁，那么弯曲面呈凹状。
The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls.
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