Isotopes
n. 核素；同位素（isotope的复数）
🗣️ 情景例句
Oh, I'm sorry Susan isn't here.
啊 可惜Susan不在。
I'm dying to see you.
我真想见你。
Once we get down to the oil, it usually flows to the surface because great pressure,
一旦到达油层，石油就会由于地下巨大的压力流到地面上来，