endocrine system
hormone secretion
pituitary gland
thyroid gland
adrenal gland
1. The pituitary is an important ductless gland.
垂体是一个重要的内分泌腺。
2. Hormones are released by a ductless gland directly into the blood.
激素由内分泌腺直接释放到血液中。
3. Understanding how a ductless gland works is essential for biology.
了解内分泌腺的工作原理对生物学至关重要。
A: Is the thyroid considered a ductless gland?
A：甲状腺被视为内分泌腺吗？
B: Yes, it is one of the most active ductless glands in the human body.
是的，它是人体中最活跃的内分泌腺之一。
1) 内分泌腺
2) 无导管腺体
3) 直接向血液分泌激素的腺体
1. 内分泌腺
e.g.
The endocrine system consists of several ductless glands.
内分泌系统由几个内分泌腺组成。
noun phrase
1. A gland that secretes hormones directly into the blood rather than through a duct.
Synonym: endocrine gland