buy sth up的用法和樣例：
例句
- I hear there's going to be a price increase soon, but keep it under wraps or everybody will buy them up.
我聽說很快就要漲價了，不過要保密，否則大家會把它們全買光的。 - The store was cleaned out of cigarettes by customers who expected the price to go up.
該店鋪的香煙全被顧客買光了，他們估計煙價要上漲。 - It's unwise to tie up all your money in shares.
你把所有的錢全買了股票不能動用，這樣不明智。 - The big banks agree to buy out the little banks at an appropriate discount.
大銀行同意按適當的折算率把小銀行的貸款全買過來。
