常见海鲜的复数型

常见的海鲜shrimp,fish,squid不用复数型
也就是说 one shimp, two shrimp, three shrimp (都不加s)
     one fish, two fish, three fish
而mussel,clam则有复数型
one mussel, two mussels, three mussels

章鱼
octopus (单数)
octopi (复数,多用于口语)
one octopus, two octopi, three octopi

Though many people say \"octopi\", it's wrong. It's not a Latin word:
\"octopus\" is Greek (\"octo\" = \"eight\", pus\" = \"foot\"). The Greek plural of
\"pus\" is \"podes\", therefore the plural of \"octopus\" should be \"octopodes\".
However, in English, the plural of \"octopus\" is \"octopuses\".