1·Once more he felt the sense of captivity heavy upon him.
他又一次感到被囚禁的感觉沉重地压在他身上。
2·Thus they are not able to "experience life" and so they attain a high life span in captivity.
因此,他们不能“体验生活”,从而在囚禁中获得了较长的寿命。