★ buy
① vt＆ⅵ买;购买(bought, bought) 反义词sell
▲ buy sb sth /buy sth for sb
buy him a gift/buy a gift for him
为他买礼物
②vt.(付出一定代价)获得
He bought fame at the cost of his health and happiness.
他牺牲健康和幸福换来了名声。
▲ buy up 迅速地囤积;大量买下
I highly recommend that you buy up all his records.
我强烈建议你去把他所有的唱片都买回来。
★ buyer 买主;买家
★ sell
①vt＆vi. 卖(出)（sold,sold）
I sold my computer to my neighbor for $250.
我以250美元的价格把自己的电脑卖给了邻居。
②vt. (个人、商店)出售;(商品)卖出(个数量);
They sell candy, cookies and cakes at the supermarket.
他们在那家超市卖糖果、饼干和蛋糕。
▲ sell off 廉价出售(存货)
The store sold off its summer stock to be ready for the new winter goods.
该店将夏季存货削价出售，以便购进冬季新货。
▲ sell oneself 自荐:
You really have to sell yourself at a job interview.
求职面试的时候，你的确要推销自己。
▲ sell out/be sold out 售完
All the tickets for today's performance are sold out.
今天演出的票全部卖光了。
★ seller 卖者;销售物
★ purchase
①vt 买;购买;(以努力等)换得
Tickets may be purchased in advance from the box office.
可以预先在售票处买票。
They purchased freedom with their blood.
他们以鲜血换得了自由。
②n. 买;购买;(以努力等)换得
purchase and sale
买卖
That's really a good purchase.
这个买得真值啊。
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