盖子是容器的一部分，它起到封闭或密封的作用，通常盖子可以完全封闭物体。有些盖子有一个安全条或防拆带，这样可以将盖子牢牢地固定住，直到盖子需要被人打开为止。早在公元前3100年的陶器上就已经出现了盖子[1]。
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