translation.en: They're good at dealing with the main problem of collective search, which is the trade-off between searching very thoroughly and covering a lot of ground.
translation.zh: 它们非常善于解决集体搜索中的 主要问题, 即如何在两个不同的目标之间权衡 既要能够搜索的彻底 又要搜索的范围广.