When we enter the natural environment of a lake, we enter a territory where human activities must be rigorously controlled keeping the lake in mind.
(we; enter; the natural environment of a lake) (we; enter; a territory where human activities must be rigorously controlled keeping the lake in mind; T:When we enter the natural environment of a lake) (human activities; must be rigorously controlled; L:a territory) (human activities; keeping; the lake; in mind)
we we human activities human activities
enter enter must be rigorously controlled keeping
the natural environment of a lake
a territory where human activities must be rigorously controlled keeping the lake in mind T:When we enter the natural environment of a lake
L:a territory
the lake in mind