年幼者密度测定数据的获得和解读仍颇具挑战性，因此这项工作应在有经验的儿科密度测定中心进行。
Acquiring and interpreting densitometry data from younger patients remains challenging and should be performed in experienced pediatric densitometry centers.
改进的改良半叶法测定光合强度，具有易操作，易掌握，且测定数据更准确的特点。
It is easy to operate and master and more accurate to determine the data when the improved half leaf method is improved and used to determine photosynthetic intensity.
统计检验结果表明，两种方法的测定数据组均无异常值并遵从正态分布，因此两种测定方法均具有实用性。
Statistical inspection results showed that the two groups of measuring data determined respectively by GC and UV were in compliance with normal distribution, therefore, both methods are practical.
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