We say "could" because only some of these standards exist today.
之所以这样说，是因为目前只存在部分这类标准。
Some problems still exist in the establishment of the therapeutic standards with traditional Chinese medicine.
中医在诊疗标准的制定方面仍然存在许多缺陷。
Some problems exist in declared data with regard to tentative standards of new drugs of Traditional Chinese Medicine becoming official standards.
目的：中药新药试行标准转正式标准申报资料中存在着多种问题。
Results Nowadays TCM reference standards have got great achievement, however still exist some trouble on value assignment and supplement.
结果中药标准物质取得了一些可喜的成就，还存在一些技术及供应方面的问题。
Results Nowadays TCM reference standards have got great achievement, however still exist some trouble on value assignment and supplement.
结果中药标准物质取得了一些可喜的成就，还存在一些技术及供应方面的问题。
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