Nonradioactive
n. 非放射性
🗣️ 情景例句
How is everyone in your family?
全家都好吗？
At bedtime, I take off my clothes and put on my pajamas.
在上床时间，我脱掉衣服并且穿上我的睡衣。
as the wave leaves the particles behind back to its starting point again.
当波浪把微粒留在身后时又回到出发点。