Sievert
unit [核]西韦特单位(γ射线剂量单位)
🗣️ 情景例句
Speaking of mother and of father
谈到孩子的爸， 孩子的妈，
By the street of Bye and bye one arrives at the house of Never.
迁延因循，一事无成。
Who was first? Who was second? Who was third?
谁是第一？谁是第二？谁是第三？