Decay series
[化] 衰变系; 放射系
🧩 词语组成解析
🗣️ 情景例句
This small child is quite self-centered. Maybe he is spoiled by his family.
这个小孩挺以自我为中心的，可能是被家人宠坏了。
How was your flight? Was it comfortable?
你坐的班机怎么样？还舒服吗？
but the fire fighters were eventually able to free him by cutting a huge hole in the wall.
消防队员在墙上挖了个大洞，才终于把他解救出来。