Astronomers have fretted over this for a long time, but trying to find such planets is hard.

天文学家已经为此烦恼了很长时间，但是要找到这样的行星是很困难的。

" Dear Pip, " said Biddy, " you are sure you don't fret for her" ?

“亲爱的皮普，”比迪说，“你确定你不为她担心”？

" I see I have the means of fretting him out of his melancholy for some time to come" .

“我知道我有办法让他在未来一段时间内摆脱忧郁”。

Does it not fret for trifles, cry for the pretty pebbles with which to build its shifting palaces, for the flowers forgotten as soon as plucked?

难道它不为琐事而烦恼，为建造它移动的宫殿的漂亮鹅卵石而哭泣，为采摘后立即被遗忘的花朵哭泣吗？