To “map” travel properly, the software needs to understand such things as time zones, flight duration, layovers, and the like, along with concepts such as coach or first class, deluxe and standard rooms, double vs. single, and so on. That is why there is a whole separate vertical market for travel, but one that first Bing, and now Google (with the acquisition of ITA Software), may be claiming.
旅游等某些领域甚至更为复杂。 要想准确“描述”旅游，软件需要对时区、飞行时间、中途停留等等有所了解，还要了解经济舱或头等舱、豪华间和标准间、双人间和单人间，以及诸如此类的概念。 旅游也因此发展成一个独立的垂直市场，但先是必应、现在是谷歌（收购ITA软件公司后）可能获得一部分市场份额。