预先购买机票比较便宜。

It's cheaper to buy flight ticket in advance.

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从今天开始，广大市民可以预先购买世博会的个人入场门券。

Starting from today, individual tickets of the Shanghai Expo are available for sale to the general public.

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在预先购买服务的律师介绍，这样的买家尽快知道房地产有关的政策为了保护自己的权利和利益。

In the pre-purchase services on the introduction of a lawyer, so that buyers know as soon as possible real estate-related policies in order to protect their own rights and interests.

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