我们发现,春天的时候,他们在山坡上种植树是很有必要的.这里可以用that引导宾语丛句,但也可以省略.（英语就是这么麻烦,we've found （that） it is necessary for them to plant trees on the hills in spring.it 是...
we've found (it) is necessary for them to plant trees on the
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