This fear was not groundless for he himself had really seen it happen to other moulting crabs.

身子还软，要被别的螃蟹吃去的，这并非空害怕，他实在亲眼见过。

The penguin in the photo is halfway done with moulting its down, but he is rather late already.

照片中的企鹅换羽过程进行了一半，但他已经比同伴们迟多了。