PHRASE
(引出另一種選擇)如果不能的話，萬一不行的話
You say failing that to introduce an alternative, in case what you have just said is not possible.
例句
Find someone who will let you talk things through, or failing that, write down your thoughts.
找個(gè)能讓你把事情說清楚的人，如果不行的話，就把你所想的寫下來。