Through thick and thin, they have always been my precious team mates, advisers, and above all, friends.
我们同甘共苦,亲如伙伴,他们是我的军师,更是我的朋友。
I'm very sorry. Usually I'm very careful. I have never lost a book before. It won't happen again.
“很对不起。通常我是非常小心的。我以前从来没有丢过书。这样的事不会再发生了。”