To answer the first part of your question, I'd like to say that our studies were very extensive.
你问题的第一部分,我要说的就是我们的研究非常广泛。
Young men who have reason to fear that they will be killed in battle may justifiably feel bitter in the thought that they have cheated of the best things that life has to offer.
有理由害怕自己会死在战场上的年轻人,想到自己被剥夺了生活所能给予的最美好的东西时,感到痛苦,这是可以理解的。