A quatrain may also be any group of four lines unified by a rhyme scheme. Quatrains usually follow an abab, abba, or abcb rhyme scheme.
四行诗通常是通过押韵组合成的四行诗节的诗，亚运形式一般为abab， abba，或abcb。
Methods Rabbit marrow stem cells (MSCs) were cultured and expanded in vitro. The MSCs were mixed with acellular bovine cancellous bone (ABCB).
方法：体外扩增诱导兔骨髓基质干细胞，将其与去细胞牛松质骨复合培养。
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