Decay of activity
[化] 活性衰减
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
OK. Since you put it this way. I'll have to comply.
好吧。既然你这么说，我只好同意了。
It's about time.
时间差不多了。
Let me see. It's about four thirty.
我看看，大约四点半了。