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inert gas /ɪnˈɜːt ˈɡas/ n

中文：惰性气体

中文 · 惰性气体Español · gas inerteFrançais · gaz inerte
Meaning：Gas inserted in the bulb to slow down evaporation of the filament.
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Found in these illustrated scenes（2）

Incandescent bulb Halogen lamp

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