Clide
放射性核素浓度
🗣️ 情景例句
I promise I won't leave early.
我发誓我再也不会早走了。
Personally,I prefer winter weather.
个人而言,我比较喜欢冬季天气。
But every night he heard the noise upstairs.
但每天晚上他都听到楼上的声音。