单词：ground mass
ground mass的用法和样例：
例句
- MALDI MS imaging for tissue section analysis has opened a newarea in clinical mass spectrometry.基质辅助激光解吸电离质谱成像技术分析组织切片已成为临床质谱学的一个新领域。
- Among the fibers are minute air spaces containing a glue-like mixture called ground substance.纤维之间有微小空隙，内含胶状混合物，叫做基质。
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Theres a simple way to figure out where the center of mass is. If the big kid is two times as heavy as the little kid, then their mutual center of mass will be two times closer to the big kid than to the little kid. Three times heavier and the center
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