Specific activity
[化] 比活; 比活度; 比放射性; 放射性比度\\n[医] 特殊活动
🧩 词语组成解析
🗣️ 情景例句
I don't know what I would do without you.
我真不知道没有你们我怎么办。
One never loses anything by politeness.
有礼貌对自己不会吃亏。
It's a waste of time reading that book. It's rubbish.
看那本书真是浪费时间。那简直是垃圾。