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stagnant
adj
stagnate
v
例
They drained the stagnant water to prevent mosquito breeding.
The stagnant water in the pond had a foul odor and attracted mosquitoes.
The stagnant air in the room felt stuffy and oppressive.
The stagnant river had no flow, with algae growing on its surface.
The river flowed sluggishly in the stagnant marsh.
