因為我覺得是前面的the white blood cells...
9. those 為代名詞,代替前面的核数名词 wounten若 代替的名同為數,則用代名詞 that -
Bay We all know that stress seems to age people. There's the old cliché of getting prematurely hair from stress, for example. 6. scientists don't fully understand how the mind effects the body, previous research has indicated that stress has a negative effect on the mune system, for stress 7. the production of a hormone called cortisol, which can have detrimental physical effects, Recently, more evidence has shown that chronic psychological stress & the biological iging process. In a new study, researchers compared the white blood cells in women who Leported long-term stress from caring for chronically-ill children to? 9. 9. of women who cared for healthy children. They found that the cells of the former aged 10 years faster. This study also suggests that finding ways to manage stress can avoid potential biological damage.