Stem-sap flow的用法和樣例：
例句
- Stem sap flow density characteristics of ailing Betula platyphylla in 2001 was concerned with physiological control of transpiration.
葉感病白樺樹榦液流具有以上特點，是因為具有較強的蒸騰生理調控力，以適應葉部病害而求得生存。 - Thermal dissipation method was applied to study the stem sap flow of Betula platyphylla for two consecutive growing seasons.
摘要應用熱擴散法，對白樺樹榦液流進行連續兩個生長旺期測定。
