The dye was much cheaper than sea snail dye.

这种染料比海螺染料便宜得多。

The winkle is often called the sea-snail, because it lives in the sea, and looks like a snail.

滨螺也叫“海蜗牛”, 因为它生活在海里, 看上去又很像蜗牛。

Its abdomen is soft, so a hermit crab uses the empty shell of a sea snail to protect itself.

它的腹部是软的，所以寄居蟹用一个空的海洋蜗牛的壳来保护自己。