英语 请问again作何解释,and then that的that从语法上有何作用?

题目

英语 请问again作何解释,and then that的that从语法上有何作用?
when I see how all our energies are wasted in providing for mere necessities,which again have no further end than to prolong a wretched existence; and then that all our satisfaction concerning certain subjects of investigation ends in nothing better than a passive resignation

答案

相信你意思都明白的,就不翻译了again--这里做反响,回应的意思比如:You will be loved again.你的爱定会得到回报.至于THAT,联系上下文,应该是when I see that all our satisfaction concerning certain subjects of i...