The sliky case which covers the eggs of many spinning insects until they are hatched.

茧。

Any of various similar coverings, as of certain spider.

(蜘蛛的)子囊；卵袋。

Plastic sprayed over inactive army and navy equipment to prevent rust.

(枪械上的)防锈塑胶。

To keep something in a protective covering.

【罕】盖住...以保护。