I had built up a body of customers.中的“a body of”怎么解释?

请问a specialized body of knowledge 中的body What letter is a body of water? “What letter is a part of body? Which letter is a part of body? what letter is a part of body? a whole body of research shows that I have a health body怎么翻译? what is a body of a letter?用英文回答 I have no feet but I have a long body .some of my family mem 英语单词的理解在"a growing body of research"这个短语中,"body"作何解? I have a body,too. I have ａ fat body.用ａ fat body.提问