He discovered that all grassland squirrels made straight for the trees when pursued, and only chose holes in the ground, or hollow logs, as a last resort.
他发现,所有的草地松鼠当被追捕时,首选都是直爬上树,实在没有办法时才选择地洞或中空的木钻。
As a last resort, go away and never come back.
不得已,就走开别再回来。
I've tried everyone else and now you're my last resort.