Isotopes
n. 核素；同位素（isotope的复数）
🗣️ 情景例句
I've mailed off several applications for jobs that interest me.
我已经寄出了几份求职材料，应聘我感兴趣的职位。
I ought to go to bed now.
我应该现在去睡觉。
Hello! Where are you from?
你好，你是从哪里来的？