Water is absorbed from the ground by the roots of the tree, travels through tubes to the green leaves, and is partly evaporated into the atmosphere by transpiration, and partly transformed into organic matter in the chloroplasts by photosynthesis, and transported throughout the tree. The part of the water that evaporates into the atmosphere returns to the ground by rain and is absorbed by the roots.
水从地下由树的根吸收，经导管到达绿叶，部分经蒸腾作用蒸发到大气，部分在叶绿体经光合作用转变成有机物，运到树全身各处。蒸发到大气的那部分水，经降雨回到地下，又由根吸收。
如何保护树木的办法：The ways to protect trees. 如何用水How to use water .
如何保护水资源的办法:The ways to protect water resources.
重点在于“方法”，，应该突出Ways ，，如果作为标题使用，，这样翻译更确切些
