长江是最长的河流，也是世界第三长的河流。它发源于青海省唐古拉山脉，在青海、、四川、云南、重庆、湖北、安徽、江苏等省市流经，最终注入东海。长江全长约6300公里，流域面积约180万平方公里。

How to pronounce: [cháng jiāng]

Usage:

长江可以用作名词，指最长的河流，也可以用作地名。

Example sentences:

1. 长江是的母亲河。

The Yangtze River is the mother river of China.

2. 乘船游览长江是一种难忘的体验。

Taking a boat trip on the Yangtze River is an unforgettable experience.

3. 长江上有许多著名的大桥。

There are many famous bridges over the Yangtze River.

4. 长江流域是重要的农业区。

The Yangtze River Basin is an important agricultural area in China.

5. 今年夏季，长江发生了严重的洪灾。

The Yangtze River experienced severe flooding this summer.

Synonyms and usage:

1. 扬子江 (yáng zǐ jiāng) - another name for the Yangtze River, often used in literature and poetry.

2. 长水 (cháng shuǐ) - a poetic name for the Yangtze River, literally meaning "long water".

3. 长江三峡 (cháng jiāng sān xiá) - the Three Gorges of the Yangtze River, a famous scenic spot in China.

4. 长江水利 (cháng jiāng shuǐ lì wěi yuán huì) - the Yangtze River Water Resources Commission, responsible for managing and regulating water resources in the Yangtze River Basin.

Editor's summary:

长江是最长的河流，也是世界第三长的河流，它对人民和文化有着重要的意义。在使用时，可以根据语境选择具体的词语，如扬子江、长水等。同时，我们也要关注长江的生态环境保护和防洪措施，共同守护这条伟大的母亲河。