It makes sense to be busy living or busy dying.
主要的义务规则是那些要求或禁止某些行为的规则。
The most important part of teaching is to teach what it is to know.
It is indeed an opinion strangely prevailing amongst men， that houses， mountains， rivers， and in a word all sensible objects， have an existence， natural or real， distinct from their being perceived by the understanding.