closed-circuit

closed-circuit的音标是[kləʊsɪd ˈsɪərɪtɪ]，意思是“闭路电视”。基本翻译为“闭路电视系统”，即一种用于传送、接收或记录电视信号的电子设备。速记技巧是注意其发音中的元音字母和辅音字母，以及重音和语调。

Closed-circuit的英文词源是拉丁语“closus”和“circuitus”，意为“封闭的环路”。它的变化形式包括名词的复数形式“closed circuits”和过去式、过去分词形式“closed the circuit”。相关单词包括：

1. Circuit：电路，闭路，巡回。这个词在电子工程中常用，表示一个完整的电路路径。

2. Loop：环路，圈，回路。这个词与“circuit”同源，表示一个封闭的路径或形状。

3. Loop-hole：漏洞，小孔，缝隙。这个词源于“loop”和“hole”，表示一个封闭的空间或小孔洞。

4. Camera-circuit：闭路电视，摄像机电路。这个词组表示使用摄像机进行监控的闭路电视系统。

5. Back-up-circuit：备用电路，备份电路。这个词组表示在主电路出现故障时使用的备份电路。

6. Circuit-breaker：断路器，短路开关。这个词表示一种自动断开电路的设备，用于保护电路免受短路故障的影响。

7. Circuit-board：电路板，线路板。这个词表示电子设备中用于连接各种电子元件的电路基板。

8. Circuit-breaker switch：断路器开关，短路开关开关。这个词组表示一种特定的开关设备，用于控制电路的通断。

9. Circuit-tank：闭路水箱，循环水箱。这个词组表示用于循环水的设备或容器。

10. Circuit-breaker device：断路器装置，短路保护装置。这个词组表示一种用于保护电路免受短路故障影响的装置。

以上单词和词组都与“closed-circuit”相关，反映了它在不同领域的应用和变化形式。

常用短语：

1. closed circuit television (CCTV)

2. closed-circuit broadcast

3. closed-circuit editing

4. closed-circuit receiver

5. closed-circuit logic

6. closed-circuit television system

7. closed-circuit advertising

双语例句：

1. 安装了闭路电视后，犯罪率明显下降。 (Installed CCTV, the crime rate has significantly decreased.)

2. 这次比赛是通过闭路电视直播的。 (The match was broadcast live on closed circuit.)

3. 编辑在制作节目时需要使用闭路编辑系统。 (The editor needs to use the closed-circuit editing system when producing the program.)

4. 闭路接收器可以接收来自不同来源的信号。 (The closed-circuit receiver can receive signals from different sources.)

5. 逻辑电路是电子设备中常见的组成部分。 (Logic circuits are a common component in electronic devices.)

6. 广告商在电视上播放的广告通常通过闭路广告播放。 (Advertisements broadcast on television by advertisers are usually through closed-circuit advertising.)

英文小作文：

Closed-Circuit Television in Our Life

Closed-circuit television (CCTV) has become an essential tool in our daily lives, providing security and safety for our homes, businesses, and communities. From monitoring parking lots to protecting important facilities, CCTV has become an integral part of our security systems.

In addition to its practical applications, CCTV has also become a popular tool for entertainment and advertising purposes. Viewers can enjoy live broadcasts of sports events, concerts, and other events on closed circuit television channels. Similarly, advertisers can use CCTV to display their messages directly to targeted audiences, increasing brand awareness and sales.

Moreover, CCTV systems have also become an integral part of our educational systems, providing real-time monitoring of classrooms and other learning environments. This allows teachers and parents to monitor student behavior and provide timely feedback, enhancing the quality of education and student safety.

Overall, CCTV has become an indispensable tool in our daily lives, providing security, safety, entertainment, and education. Its widespread use has made our lives safer and more convenient.