When people feel lonely, are grieving the loss of a loved one, or are struggling to make ends meet, their bodies go into threat mode.

当人们感到孤独，为失去所爱的人而悲伤，或为维持生计而挣扎时，他们的身体就会进入威胁状态。

youdao

But as the hormone level in their bodies decline, bone loss starts to play havoc with their skeletal strength.

但是伴随老龄而产生的激素水平降低，骨分丢失开始严重破坏骨胳强度。

youdao

Americans had to identify find, invent, create the means and mechanisms to manage more than half a million dead: their deaths, their bodies, their loss.

NPR: 'Republic of Suffering' Author Drew Gilpin Faust

"One of the reasons that diets are so ineffective in producing weight loss for some people is that their bodies adjust to the reduced calories by also reducing their metabolism, so that they are 'defending' their body weight, " says Dr. Alan Saltiel, the lead researcher at the University of Michigan.

CNN: STORY HIGHLIGHTS