记号指字符串的一个子串，它位于字符串的空格之间，或者位于空格和串尾之间。
A token is a substring occurring between space characters in the string or between space characters and the end of the string.
它们的身体呈流线型，后肢完全消失，身体上长出了尾片和喷水孔，所有这些特征都无法掩饰它们与陆生哺乳动物之间的亲缘关系。
Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land dwelling mammals.
结果说明臂旁核和迷走神经背核簇尾侧部之间有交互联系。
The result indicates that there are reciprocal connections between the parabrachial nucleus and caudal portion of the dorsal vagal complex.
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