你要是买新高保真音响,要货比三家买最合算的.If you're buying a new hi - fi , shop around for the best price.我一开始就知道那是不合算的.I knew right from the beginning that it would not pay.从长远观点来看, 买质量好的物品还是合算的.In the long run, it is aneconomy to buy...

“合算的”的英语可以翻译为：economical，lucrative，[经] profitable，paying，cost-efficient ...