小學一學時四十五分鐘。

　　In primary schools, a class hour has45 minutes ( or a period is45 minutes long).

　　花四十五元獲得享受傳統(tǒng)文化熏陶的機會（b約翰西蒙）

　　Could afford up to forty-five bucks a throw to wax sentimental over their heritage ( bJohn Simon)

　　對了，大偉，我要開外面那輛Petro Chem油車往西邊走，大概四十五分鐘的車程吧。

　　Well, Davy, I'm driving that Petro Chem tanker out there and I'm headed west in about forty-five minutes.

　　訂購數(shù)量達到五百片的話，RS-5的價格是四十五美元。

　　The price on the RS-five is forty-five U.S.dollars for quantities up to five hundred units.