The secret ingredient is chlorophyll , which aids in overall digestive function .
它的秘密成分是叶绿素，有助改善整个呼吸道功能。
Scientists use these observations to estimate chlorophyll concentration ( bottom ) in the water .
科学家们利用这些观测估计水中的叶绿素浓度（下图）。
When there 's a lot of chlorophyll around , they see a lot of green light .
而当周围环境中存在大量的叶绿素时，光受体“看”到的是较多的绿光。
Plants look green because the chlorophyll pigment in their leaves absorbs pretty much all sunlight except green .
植物是绿色的，那是因为树叶里有叶绿素色素，它吸收阳光里除了绿色之外的几乎所有颜色波长。
These deviations reveal spectroscopic features associated with the absorption or emission of light from molecules of biological interest such as oxygen or chlorophyll .
