What she said is a matter of complete indifference to me.
她的話對(duì)于我來說完全無關(guān)緊要。
It's a complete mystery to me why they chose him.
我真無法理解他們?yōu)槭裁磿?huì)選他。
He's a complete stranger to me.
他對(duì)我完全是個(gè)陌生人。