closed-circuit的音標(biāo)是[kl??s?d ?s??r?t?]，意思是“閉路電視”。基本翻譯為“閉路電視系統(tǒng)”，即一種用于傳送、接收或記錄電視信號的電子設(shè)備。速記技巧是注意其發(fā)音中的元音字母和輔音字母，以及重音和語調(diào)。

Closed-circuit的英文詞源是拉丁語“closus”和“circuitus”，意為“封閉的環(huán)路”。它的變化形式包括名詞的復(fù)數(shù)形式“closed circuits”和過去式、過去分詞形式“closed the circuit”。相關(guān)單詞包括：

1. Circuit：電路，閉路，巡回。這個詞在電子工程中常用，表示一個完整的電路路徑。

2. Loop：環(huán)路，圈，回路。這個詞與“circuit”同源，表示一個封閉的路徑或形狀。

3. Loop-hole：漏洞，小孔，縫隙。這個詞源于“l(fā)oop”和“hole”，表示一個封閉的空間或小孔洞。

4. Camera-circuit：閉路電視，攝像機電路。這個詞組表示使用攝像機進行監(jiān)控的閉路電視系統(tǒng)。

5. Back-up-circuit：備用電路，備份電路。這個詞組表示在主電路出現(xiàn)故障時使用的備份電路。

6. Circuit-breaker：斷路器，短路開關(guān)。這個詞表示一種自動斷開電路的設(shè)備，用于保護電路免受短路故障的影響。

7. Circuit-board：電路板，線路板。這個詞表示電子設(shè)備中用于連接各種電子元件的電路基板。

8. Circuit-breaker switch：斷路器開關(guān)，短路開關(guān)開關(guān)。這個詞組表示一種特定的開關(guān)設(shè)備，用于控制電路的通斷。

9. Circuit-tank：閉路水箱，循環(huán)水箱。這個詞組表示用于循環(huán)水的設(shè)備或容器。

10. Circuit-breaker device：斷路器裝置，短路保護裝置。這個詞組表示一種用于保護電路免受短路故障影響的裝置。

以上單詞和詞組都與“closed-circuit”相關(guān)，反映了它在不同領(lǐng)域的應(yīng)用和變化形式。

常用短語：

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

雙語例句：

1. 安裝了閉路電視后，犯罪率明顯下降。 (Installed CCTV, the crime rate has significantly decreased.)

2. 這次比賽是通過閉路電視直播的。 (The match was broadcast live on closed circuit.)

3. 編輯在制作節(jié)目時需要使用閉路編輯系統(tǒng)。 (The editor needs to use the closed-circuit editing system when producing the program.)

4. 閉路接收器可以接收來自不同來源的信號。 (The closed-circuit receiver can receive signals from different sources.)

5. 邏輯電路是電子設(shè)備中常見的組成部分。 (Logic circuits are a common component in electronic devices.)

6. 廣告商在電視上播放的廣告通常通過閉路廣告播放。 (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.