(pos:語句)<explanation>yue:冇辦法知道eng:unable to find out; unknown<eg>yue:至於佢點解會喺日本就不得而知嘞。 (zi3 jyu1 keoi5 dim2 gaai2 wui5 hai2 jat6 bun2 zau6 bat1 dak1 ji4 zi1 laak3.)eng:The reason why he's in Japan is anybody's guess.