They've bought themselves a new car.

　　他們給自己買了一輛新車。

　　She bought a small plot of land to build a house.

　　她買了一小塊地蓋房子。

　　My own feeling is that we should buy the cheaper one.

　　我個人的意見是我們應該買較便宜的那個。

　　We can deduce a lot from what people choose to buy.

　　從人們選購的東西可以作出多方面的推斷。

　　It seems only reasonable to ask students to buy a dictionary.

　　要學生買一本詞典，好像也沒什么不合情理。