Just like ants that leave a chemical trail each time they bring food back to the nest, we leave real-time feedback each time we visit a page or select (or ignore) a result.

正如蚂每次蚁搬运食物时都会留下化学信号，当外膜浏览某个网页或选择（忽略）某条搜索结果时，也留下了一种实时的反馈信息。