Be careful while you are in Brazil because sometimes people charge really high prices for everything just because you are a tourist.

charge 是动词，意思是"收费、要价"。这个词可以指各种形式的收费行为，从商品价格到服务费用都可以用。在商业交易中，charge 通常指卖方对商品或服务设定的价格。