谁帮我翻译这句：“当他看见那棵树，他就想起了他的童年时光。”

while只能与表状态的从句连用，recall能用进行时么？
即：While he was seeing that tree,he recalled his childhood.
While he is seeing that tree,he recalls his childhood.
这样语法正确。
但我建议：Once he saw that tree, he recalled his childhood.

过去式：While he saw that tree,he was recalling his childhood.
现在式：While he see that tree,he is recalling his childhood.

When he saw Nake tree, he thought of his childhood time