Radiostrontium
n. [化] 放射性锶
🗣️ 情景例句
I've put an X next to the place where you should sign.
我已在你该签名的地方后面标示了X。
Use a book as a bee does flowers.
读书如蜜蜂采花，吸取其中之精华。
Hello, Helen.
你好，海伦