1·Vegetation regrows in proportion to the sunlight that manages to work its way though the dense cloud cover.
植物因光照程度的不同，在阴云笼罩下努力地参差生长。
2·The human body regrows its outer layer of skin every two to four weeks, and bits and pieces of the old skin break off - to become dust.
人体皮肤外层每2至4周更新一次。老化的皮肤将会脱落，成为灰尘的一部分。