you (或 he等) will be lucky (或 should be so lucky)

used to imply in an ironic or resigned way that someone's wishes or expectations are unlikely to be fulfilled

恐怕是不可能的

‘A shirt would be nice.’ ‘You'll be lucky.’.

“要是有一件襯衫就好了。”“不大可能吧。”。

lucky devil (或 lucky you, her，等)

used to express envy at someone else's good fortune

幸運的家伙（表達對別人好運的嫉妒）