英语语法分析

The broker will get 5% if he finds a purchaser.

这个中间人如果找到一个买主就将提成5%。

《柯林斯英汉双解大词典》

If a purchaser fails to punch in the correct PIN at the checkout, the transaction gets rejected.

如果购买者未能在结帐时输入正确的密码，交易将不能进行。

Overall between 30% and 50% of what has been bought in developed countries is thrown away by the purchaser.

总的来说，在发达国家购买的东西有30%到50%被购买者扔掉了。