认为什么都有用,或者认为所有的语言是很有用的,这是没什么好处的.
问题补充：
It's still your duty to choose the best path to follow near the top of the mountain just as it was to propose a practicable short-cut away from the beaten track in the foothills.
beaten track 常规；惯例；踏出来的路
选择最佳路径去遵循,直到山头附近,这还是你的责任,
就像是从山脚的老路中找到一个切实可行的捷径.