树心用英文怎么说

树心在英语中是 "heartwood."

来源：树心是指一棵树内部的中心部分，是木质部的核心，不再生长，与外界隔离。

英文例句：

The heartwood of the oak tree is very strong and durable.
(橡树的树心非常坚固和耐久。)
Heartwood is resistant to decay and is often used for construction purposes.
(树心对腐朽有抵抗力，通常用于建筑目的。)

中文翻译：树心、树心木。