他对自然有着持久的热情，从童年一直保持到现在。

He has an abiding passion for nature that has stayed with him since childhood.

abiding 是动词 abide 的现在分词形式作形容词使用。abide 本意是"停留、持续"，abiding 表示"持久的、长久的"，强调某种情感或状态能够经久不变。