Originally from South America, the snails were accidentally introduced into the Ebro Delta by Global Aquatic Technologies, a company that raised the snails for fresh-water aquariums, but failed to prevent their escape.
2018年6月六级真题(第二套)阅读 Section C
柯林斯高阶英汉双解学习词典释义
N-COUNT
蜗牛
A snail is a small animal with a long, soft body, no legs, and a spiral-shaped shell. Snails move very slowly.
PHRASE
慢吞吞地;缓慢地
If you say that someone does something at a snail's pace, you are emphasizing that they are doing it very slowly, usually when you think it would be better if they did it much more quickly.