「可遇不可求」

(pos:語句)
<explanation>
yue:好難得嘅嘢，強求都冇用嘅，要咁啱遇到先得
eng:something so rare that can only be encountered by chance, and not through active search
<eg>
yue:今次嘅機會好難得㗎，真係可遇不可求，你要好好把握啊。 (gam1 ci3 ge3 gei1 wui6 hou2 naan4 dak1 gaa3, zan1 hai6 ho2 jyu6 bat1 ho2 kau4, nei5 jiu3 hou2 hou2 baa2 aak1 aa3.)
eng:This opportunity is very rare that you won't come across through seeking. You have to seize it well.