We want something that's relatively cheap, or cost-effective, because there's an awful lot of countries involved, and some of them are emerging markets, some of them emerging countries, low-income.
这种产品最好比较便宜，性价比高 因为灭蚊涉及很多很多国家 有些是发展中国家 而有些发展中国家的收入还不高。