Some ductless glands produce several different hormones.
有些无管腺产生几种不同的激素。
Endocrinology is defined as the study of the ductless or endocrine glands and their internal secretions.
内分泌学的定义是：研究无管腺或称内分泌腺及它们的内分泌的科学。
Endocrinology is defined as the study of the ductless or endocrine glands and their internal secretions.
内分泌学的定义是：研究无管腺或称内分泌腺及它们的内分泌的科学。
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