n.繭；塑料披蓋；防護(hù)噴層；宅（足不出戶）

動(dòng)詞cocoon的現(xiàn)在分詞.

A caterpillar must pass through the cocoon stage to become a butterfly. 毛毛蟲必須經(jīng)過繭的階段才能變成蝴蝶。

Silkworms make cocoons. 蠶做繭。

A cocoon is a kind of silk covering made by an insect. 蠶繭是由昆蟲制造的一種由絲組成的外包層。

Silkworms spin cocoons. 蠶作繭。