Empretron
汞弧离子管
🗣️ 情景例句
Challenge, the feeling of accomplishment, and knowing that you have made a contribution.
挑战，成就感和知道自己做出了贡献。
My home is in the capital.It's a cosmopolitan city.
我的家在首都.它是一个国际性的城市。
Make up your mind.
做个决定吧。