Take foraging as an example. Whenever an ant finds food and carries it back to the nest, that ant leaves a chemical trail (pheromones) along the way.

以觅食为例，一只蚂蚁发现食物并将其搬回蚁穴，蚂蚁会一路留下化学物质作为跟踪标记。

youdao

After I came back to him, he asked me why I would take the food in hands. I told him the truth.

回来时问我为什么手里提着这些东西，我把情况如实地告诉他。

youdao

Once that bite is down continue conversation or finish read further into that article. So long as your focus goes back to the food once you take another bite.

吃完一口饭再说话或者继续读文章，直到你的注意力回到食物上以后再咬下一口。

youdao

Android is designed to ensure the children do not stray too far away from the vision (and influence) of the Mountain View based company, and while handset manufacturers can take the glory and the sales figures, a lot of their hard work passes back up the feudalistic food chain to Google.

FORBES: How Android's 'Open' Nature Drives Google's Vision of The Smartphone

Most of the pupils - known as "talibe" in the local language, Wolof - end up begging on the streets for money and food which they have to take back to their teachers, our correspondent adds.

BBC: Senegal fire at Koranic school kills nine children

But in many boomtowns, Latinos have poured in to take up the basic jobs in construction, food and distribution that cities need to back up their growth.

ECONOMIST: The Americano dream