Oral soft tissue is composed of collagen, water, pigmented connective tissue, blood and lymphatic vessels.

口腔软组织的胶原蛋白，水，色素沉着的结缔组织，血液和淋巴管组成。

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Oral soft tissue is composed of collagen, water, pigmented connective tissue, blood and lymphatic vessels.

口腔软组织的胶原蛋白，水，色素沉着的结缔组织，血液和淋巴管组成。

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