Once they detect that the temperature is below target levels, those neurons secrete thyrotropin-releasinghormone, or TRH into the bloodstream.

一旦他们检测到温度低于目标水平，这些神经元就会分泌促甲状腺素释放激素到血液中。

When this happens, TRH also stimulates prolactin release - so hyperprolactinemia and amenorrhea occur.

与此同时，TRH也刺激泌乳素的分泌，所以也会出现高泌乳素血症和闭经。

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。

This is because low thyroid hormone levels tell the hypothalamus to release more thyrotropin releasing hormone, or TRH, and tell the pituitary to release more thyroid stimulating hormone, or TSH.

这是由于低甲状腺激素水平刺激下丘脑释放更多促甲状腺激素释放激素，即TRH，并刺激垂体释放更多促甲状腺激素，即TSH。

The cascade starts off with just a trickle, as TRH goes just a few millimeters to the anterior pituitary, where it hits receptors on cells there, causing it to release thyroid-stimulating hormone, or TSH, into the bloodstream.

这种级联从涓涓细流开始，TRH 只到达垂体前叶几毫米，在那里它击中那里细胞的受体，导致它向血液中释放促甲状腺激素或 TSH。