without fail

when you tell somebody to do something without fail, you are telling them that they must do it 務必;一定

I want you here by two o'clock without fail.
我要你兩點鐘務必來到這里.
You must be here by 8:30 without fail.
你務必在八點半之前到這兒.

always 總是;必定

He writes every week without fail.
他每周必定寫信.

She sends me a christmas card every year without fail.
她每年都給我寄一張圣誕卡,從無遺漏.

déjà vu: the feeling that what is happening now has happened before in exactly the same way 似曾相識(的感覺)

I had a strong sense of déjà vu as I entered the room.
進這屋子時我有一種似曾來過的幻覺.