a bird is() the treethere is a bird ( )the tree填on还是in

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abirdis()thetreethereisabird()thetree填on还是inabirdis()thetreethereisabird()thetree填on还是inabirdis()the

a bird is() the treethere is a bird ( )the tree填on还是in
a bird is() the tree
there is a bird ( )the tree填on还是in

a bird is() the treethere is a bird ( )the tree填on还是in
in

用in on是指果实之类的 在树上自身长的