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I think on average a well-trained dog maybe knows like 15 commands or something.我认为任何一条训练有素的狗狗都能够学会至少15种指令什么的
on average:平均
We fail one student per year on average.
我们平均每年有一个学生不及格。
On average we receive five letters each day.
我们平均每天收到五封信。
But she is really able to learn this easily而她却轻而易举地学会了
be able to:会； 能
At this rate we won't be able to afford a holiday.
照这样下去，我们不会有时间／钱去度假的。
I may be able to help you in some way.
我也许可以从某个方面去帮助你。
近义词:
be capable of会
be in a position to能够
