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 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。
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