1.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。
2.Used in ducted and ductless range hoods and over the counter microwave ovens.
使用在有和无管道式抽油烟机以及柜式微波炉中。
3.How is the temperature distribution in large refrigerated warehouses with ductless air distribution?
在无管道的大型冷库里，温度分布情况如何？
4.Some ductless glands produce several different hormones.
有些无管腺产生几种不同的激素。
5.This paper describes newly technology trend of component mounter and green technology of ductless reflow furnance.
概述了元件安装机的最新技术动向和无通风管道再流焊炉绿色技术。
6.Technical and Economical Performance Analysis on Ductless Inductive Ventilation System of the Underground Parking
地下停车场无风道透导通风系统性能及经济性分析
7.Research on the Energy Saving and Safety of Ductless Fume Hood
无管排风柜的节能与安全性研究