并列三谓语

By watching what people search for,click on and say online,companies can aim “behavioural” ads at those most likely to buy.

click on 点击

主干：companies can aim “behavioural” ads at those 状

不定式作后置定语：most likely to buy

状语：By watching

宾语从句：what people search for 谓1,click on 谓2 and 并列三谓语 say 谓3 online

参考译文：公司通过观察人们在网上搜索、点击及谈论的东西，就能够将行为广告瞄准那些最有可能购买的人群。

句子结构：aim sth at sb 使某物针对某人；用 / 将某物瞄准某人

most likely to do sth 最有可能做什么