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。
Some ductless glands produce several different hormones.
有些无管腺产生几种不同的激素。
As an important component of the ductless inductive ventilation system, the jet inducted fan is used more and more widely in ventilation system of underground garage.
射流诱导风机作为实现射流诱导通风方式的主要产品之一，在地下车库等通风系统中得到广泛的应用。
As an important component of the ductless inductive ventilation system, the jet inducted fan is used more and more widely in ventilation system of underground garage.
射流诱导风机作为实现射流诱导通风方式的主要产品之一，在地下车库等通风系统中得到广泛的应用。
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