Exposure to grassy areas has also been linked to less stress and a lower body mass index among adults.

接触草地也与成人压力较小和体重指数较低有关。

Even public transit appears associated with lower body mass index (BMI) compared to driving your own car to work.

与开车上班相比， 即使是公共交通也似乎与较低的体重指数 (BMI) 相关。

" Our findings suggest that major extensions of sleep time may not be necessary, as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index, " it added.

“我们的调查结果表明没有必要大量增加睡眠时间，每晚多睡20分钟似乎有助于降低体重指数。”

But, if light reflects off of a surface that has a lower index of refraction than the medium it's passing through, there is no phase shift, and the wave then constructively interferes with itself.

但是，如果光从折射率低于其通过的介质的表面反射，则不会发生相移，然后波会对其自身产生相长干涉。