A therapeutic dose decreases noradrenaline enough to cause side effects like constipation.

治疗剂量的阿片类药物会导致去甲肾上腺素水平减少，从而引发一些副作用，比如便秘。

Pinpoint beams of radiation are focused deep inside the brain, and wherever these beams of radiation intersect, they deposit a therapeutic dose of radiation.

精确的辐射光束聚焦在大脑深处，无论这些辐射光束在哪里相交，它们都会沉积治疗剂量的辐射。