TRH is a tropic hormone, which means that it gets the hormone cascade started by triggering the release of other hormones.
TRH 是一种热带激素，这意味着它通过触发其他激素的释放来启动激素级联。
英语百科
Tropic hormone
Tropic hormones are hormones that have other endocrine glands as their target. Most tropic hormones are produced and secreted by the anterior pituitary. The hypothalamus secretes tropic hormones that target the anterior pituitary, and the thyroid gland secretes thyroxine, which targets the hypothalamus and therefore can be considered a tropic hormone.