Helis
abbr. hot electron layer ion source 热电子层离子源
🗣️ 情景例句
If you don't apply to the relevant department your passport will never be approved.
如果你不向有关部门申请，你就得不到护照。
What's your friend doing?
你的朋友正在做什么？
You're in love!
你恋爱了！