闭合的英文意思：to close by coming together (like the lips of a wound, the doors of an elevator, the walls of a channel) / to close by connecting in a loop (like a circuit) / closed-loop
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首尾相连的；封闭的：闭合电路ㄧ闭合曲线ㄧ电冰箱各部分之间用管道相连，形成一个闭合循环系统。
使首尾相连；封闭；合上：电门一闭合，电流就通了。
