One possibility he says is that tears discharge certain chemicals from your body, chemicals that build up during stress.

他说，一种可能性是，眼泪会从身体中释放出某些化学物质，这些化学物质是在压力下积聚起来的。

youdao

Male hormones help build up the body's resistance to stress.

男性荷尔蒙有助于增强身体对压力的抵抗力。

youdao

Stress can build up and explode into problems.

压力可能积蓄并爆发出问题。

youdao

That gives the material strength, as there are fewer places for stress to build up and fractures to form than in hydroxyapatite made haphazardly of larger, more heterogeneous grains.

ECONOMIST: Nanotechnology

Radcliffe, who finished 23rd in the marathon at the Olympics after her build-up to Beijing was hampered by a stress fracture of her left thigh, showed no signs of fatigue.

BBC: Superb Radcliffe wins Great South