「未知之數」

(pos:名詞)
<explanation>
yue:未來唔知會唔會發生嘅事；一啲唔確定嘅嘢
eng:something that may or may not happen in the future; literally: something yet to be ascertained
<eg>
yue:特首會唔會連任，而家都仲係未知之數。 (dak6 sau2 wui5 m4 wui5 lin4 jam6, ji4 gaa1 dou1 zung6 hai6 mei6 zi1 zi1 sou3.)
eng:It is far from certain whether the current Chief Executive would run for a second term.