must never
千万不可
Absolutely not.
— 起风了 (2013)
千万不可低估汤姆。
Never underestimate Tom.
千万不可惊动他们
Whatever you do, don't alert them.
— 七武士 (1954)
“千万不可”
Under no circumstances.
— 霸王别姬 (1993)