請將下面這段話翻譯成英文：

　　東沙島

　　東沙島是東沙群島的主島，由民國自1946年起實際管轄，發(fā)育在東沙環(huán)礁的西部礁盤上，因為島嶼形狀如牙，俗名月牙島。島上有氣象臺、無線電臺和燈塔，便利海上航行。東沙群島地處東亞至印度洋和亞洲、非洲、大洋洲國際航線要沖，具有重大航運意義，地理位置十分重要。

　　參考譯文

　　Dongsha Island

　　Dongsha Island is the main island among Dongsha Islands. It has been under actual jurisdiction of Republic of China since 1946 and developing on the western coral reef of Dongsha Atoll. Owing to its shape, it is well known as the Crescent Island. An observatory, radio station and lighthouse can be found on the island, which aim to facilitate shipping. Dongsha Islands are located at the communications hub of various international lines from East Asia to the Indian Ocean as well as Asia, Africa and Oceania, and so has great shipping significance and crucial geographical position.

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