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nitrogen
mastery UK /ˈnaɪ.tɹə.d͡ʒən/ US /ˈnɑɪ.tɹə.d͡ʒən/noun
card 1 of 6 · fill in the blank
The mechanic improved the car's suspension by filling the _____ with nitrogen gas.
card 1 of 6 · fill in the blank
The mechanic improved the car's suspension by filling the _____ with nitrogen gas.