Hedyphane
钙砷铅矿
🗣️ 情景例句
Oh, five or six years ago.
哦，五六年前。
Perseverance is failing nineteen times and succeeding the twentieth.
十九次失败，到第二十次获得成功，这就叫坚持。
Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你们离开实验室前，务必要关上电源，关好窗户。