英语语法分析

Such burrowing discourages barnacles from clinging to their shells.

这种挖洞的方式阻碍了藤壶粘附在壳上。

In the Middle Ages, it was thought to hatch from barnacles, and thus was considered "fish" and could be eaten on Fridays.

在中世纪，人们以为本种可来自藤壶，因此视之为“鱼”，并可在星期五吃。

When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles.

然而，当蟹完全长大后，它们不需要穴居就能很容易地承受潮汐流，因此它们获得了大量的藤壶。