shellfish可數嗎

例句：

Think about where fish and shellfish live.

想想魚類和貝類所生活的環境。

He collected shellfish and other sea treasures.

他收集貝類以及其他海洋珍品。

They made a living as divers, spearfishing or harvesting shellfish.

他們以潛水、魚叉捕魚或收穫貝類為生。

The plover lives by the ocean and feeds on small shellfish, insects and plants.

它們生活在海邊，以小貝類海鮮、昆蟲和植物為食。