输乳小管 meaning in English

lactiferous tubules

Usually , white spots are caused by milk solids blocking the openings of the milk ducts onto the nipples
乳头出现白点是因为通往乳头的输乳小管管口被奶块（固体）堵塞所致。
When milk is not effectively removed from the breast , it can cause blockage in one of the small ducts that transport milk from the breast to the nipple
假如未能有效地排“空”乳汁，由乳腺细胞通往乳头的其中一条或多条输乳小管可能会因而堵塞。