Plants are 90 percent water, and a thriving 100-year-old tree needs to replace close to half a metric ton of water lost to evaporation every day. Without an unending supply of water, a tree will be hard pressed to grow big.
一棵枝繁葉茂的百年大樹，每日需要不斷蒸發、補充將近一噸的水份，除非水源源不絕，否則要能成長為大樹不易。