Isotopes
n. 核素；同位素（isotope的复数）
🗣️ 情景例句
They'll be at your door within a few minutes.
他们会尽快送到你的门口。
The country is rich in natural resources.It has mineral deposits.
这个国家有丰富自然的资源。它有很多的矿床。
' The manager was sympathetic, but he could do nothing.
”经理深表同情，但却无能为力。