| 字词 | 闭合 |
| 释义 | ～电路{closed-circuit}|～曲线{closed curve}|电冰箱各部分之间用管道相连,形成一个～循环系统。{As the various parts of a refrigerator are connected by pipes, they form a closed circulatory system.} 电门一～,电流就通了。{The electric current will be energized once it is switched on.} |
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