self-sealing
adjective uk/ˌselfˈsiː.lɪŋ/ us/ˌselfˈsiː.lɪŋ/
（信封、塑料袋等）带自封条的
A self-sealing envelope or plastic bag can be closed by pressing two sides of it together.
I hope the envelopes are self-sealing because I've got a very sore tongue! 我希望信封是带自封条的，因为我的舌头很痛！
Store the fruit in airtight containers or self-sealing plastic bags. 将水果存放在密封容器或自密封塑料袋中。
Synonym: self-seal
（管道、轮胎、容器等）自动密封的
A self-sealing pipe, tyre, container, etc. can automatically seal (= close) small holes in its surface.
I'm prepared to bet those pipes are self-sealing. 我敢打赌这些管道是自动密封的。
The aircraft are fitted with self-sealing tanks and enhanced armour protection to make them combat capable. 这些飞机配备了自密封油箱和强化的防护装甲，使其具备作战能力。
能形成（防止渗漏的）保护层的
A self-sealing substance forms a cover or structure that prevents air, water, etc. from entering or leaving it.
I ordered 4 bags of self-sealing cement. 我订购了4袋自愈合水泥。