It's not extensive in the sense that you just have to scatter your stuff over wide fields; that's not what it is.

它不是你泛泛的在宽广的,土地上播种就够了,它并非只是这样

耶鲁公开课 - 古希腊历史简介课程节选

That's a good number, I think that should be enough.

这数差不多，我想这样就应该够了。

How many实战 - SpeakingMax英语口语达人