Closed-circuit signaling
[电] 闭路发讯
🧩 词语组成解析
closed
[klozd]
adj. 关闭着的，封闭着的;密闭着的，保密的;<美>准备好了的，定了契约的;
v. “close”的过去式和过去分词;
clos=close关闭+ed已...的→关闭了的
n. 发信号；打信号
🗣️ 情景例句
There is still a week to go before the vacation begins.
现在距离假期还有一星期。
We can't eat so much.
我们不能吃那么多。
The noise had been so faint that no one though that the ship had been damaged.
由于这个声音非常轻，没人会想到船身已遭损坏。