Actinity
[電] 光化度
??? 情景例句
No news is good news as far as I'm concerned.
我覺得沒有消息就是最好的消息。
Do you often study history on Saturday?
你常常在星期六學歷史嗎？
Hi, Li Lei! How are you?
嗨，李壘！你好嗎？