Selfish: caring only about yourself rather than about other people 自私的
selfish behaviour/demands
自私的行为╱要求
Do you think I'm being selfish by not letting her go?
你觉得我不让她走是自私吗？
What a selfish thing to do!
这样做，多么自私！
It was selfish of him to leave all the work to you.
他把所有的工作都推给你，真是自私。
Understanding: showing sympathy for other people's problems and being willing to forgive them when they do sth wrong 善解人意的；富有同情心的；体谅人的
She has very understanding parents.
她的父母对她非常宽容。
Trivial: not important or serious; not worth considering 不重要的；琐碎的；微不足道的
a trivial detail/matter/problem
细枝末节；琐碎小事；无关紧要的问题
I know it sounds trivial, but I'm worried about it.
我知道这事听起来微不足道，但我还是放心不下。
I'll try to fix it ─ but it's not trivial(= it may be difficult to fix).
我要设法修好，不过也不是轻易就能修好的。
