冇時間喇！

PHASE is so subtle. It causes me to lose the path (失途) for more than an hour.....

聽日，我唯有對住班學生傻笑啦。我 5 題功課淨係做左 1 題咋。可唔可以扮哂幫佢地 summarize 一下 forced harmonic oscillator 乜數都唔講，然後就俾個 quiz 佢地做？

我又仲未改 quiz..... 唉..... 天台子, 早知就唔該你多野算啦.....