1. 导管：泡状或管泡状.泡状和管泡状的分泌部常称腺泡(acinus).分泌部一般由一层细胞组成,中央有腔.根据分泌部的形状,腺可分为管状腺(tubular gland ),泡状腺(acinar gland )和管泡状腺(tubuloacinar gland)(图2-
27) .2,导管(duct)导管与分汔部直接通连,

2. 管道：在张拉,固定 PS 钢束之前计算截面面积,抗弯刚度等截面特征值时使用的是从总截面(Gross Cross Section) 减去管道 (Duct)截面的净截面(Net Cross Section),

3. 管,导管：根据分泌部的形状,腺可分为管状腺(tubular)、泡状腺(acinar gland)和管泡状腺(tubuloacinar gland)(图2-
18) 2.导管 导管(duct)与分泌部直接通连,由单层或复层上皮构成.

4. 管：因为通常是将分泌物引至体表和体内的管腔中,所以附有排出管--导管(duct). 这样的腺体称外分泌腺. 另外,没有导管,而将分泌物放到血管中的分泌细胞群,也同样是腺...淋巴细胞在对抗原和促细胞分裂剂(mitogen)进行反应而增殖分化中,

1. (输送液体或气体的)管道,管子
A duct is a pipe, tube, or channel which carries a liquid or gas.

e.g. ...a big air duct in the ceiling.
天花板上巨大的通风管道

2. (人体内输送泪水、胆汁等的)导管
A duct is a tube in your body which carries a liquid such as tears or bile.

e.g. ...tear ducts.
泪管

noun

1. an enclosed conduit for a fluid

2. a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

e.g. the tear duct was obstructed
the alimentary canal
poison is released through a channel in the snake's fangs

Synonym: epithelial ductcanalchannel

3. a continuous tube formed by a row of elongated cells lacking intervening end walls