ductless

Endocrine system: Group of ductless glands that secrete hormones necessary for normal growth and development, reproduction, and homeostasis..内分泌系统：由无管腺体组成的系统，分泌激素（荷尔蒙）以供身体正常生长、 发育、繁殖和自我恒定性之需。

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。

Other endocrine glands include the pituitary, the thyroid and parathyroid, the adrenals and the ovaries and testes. Some ductless glands produce several different hormones..其它内分泌腺有垂体腺、甲状腺、甲状旁腺、肾上腺、卵巢腺与睾丸腺。有些无管腺产生几种不同的激素。