Also, the inner lining of the stomach has millions of tiny gastric pits that dive down to gastric glands.

另外，胃的内表面有无数密集分布的胃小凹，胃腺即开口于胃小凹的底部。

The teeth of Baryonyx are very sharp and pointed, but they're actually quite round and they have a fluted pattern along one side.

爪龙的牙齿尖锐锋利，但实际上这些牙齿有弧度，一侧内凹。

Raptors have an especially deep fovea— a depression in the back of their eye that fits more photoreceptors.

猛禽有一个特别深的中央凹— —它们眼睛后部的凹陷处适合更多的光感受器。