A man'life is an unreturnable pilgrimage. 人生是不能回头的旅程.
Life is an unreturnable pilgrimage . 人生就是一场不可逆转的朝圣！
Unreturnable, because all you get back is another box of chocolates. 不能退还，因为只会拿回另一盒巧克力。
I served two aces, and several unreturnable serves, compared to his none. 我有两次直接发球得分，和好几次对手无法回球，相比之下，他一次也没有。
Proper compensation shall be made or other measures shall be taken,according to the relevant regulations of the State Council,for those damaged or unreturnable. 造成损坏或者无法归还的，按照国务院有关规定给予适当补偿或者作其他处理。
And at the other end, lay one in short ? and the point is over, Federer able to flatten it out, or lace it with topspin, the ball exceptionally heavy and often unreturnable. 另一方面，费德勒时常能一击致命，这在于他能够击出平击球或者上旋球，球势格外的沉，令人难以回防。
