Take food collecting, for example.
以收集食物为例。
Let's take Mount Etna for example.
让我们以埃特纳火山为例。
A colleague, for example?
比如说同事？
Humans cannot digest plants such as grass.
人不能消化草类植物。
Wild flowers such as primroses are becoming rare.
报春花之类的'野花越来越稀罕了。
Opportunities such as this did not come every day.
这样的机会不是天天都有的。