remain

Compared meaning: continue to be in a place or state (verb).

比较义项：停留，继续处于某地或某状态（动词）。

• stay

  The everyday, neutral word for staying in a place; used in casual speech and covers physical location, staying with someone, or staying in a state.

  是表示“停留在某处”最日常、中性的说法，常用于口语，既可指停留在某个地方，也可指与某人待在一起，或保持某种状态。

  I think we should stay home tonight and relax.

  我觉得我们今晚应该待在家里放松一下。

• remain 本词

  More formal and often used in instructions, official contexts, or with a following adjective (remain seated, remain calm); sounds stiff in casual chat.

  更正式，常用于指令、正式场合，或后接形容词（remain seated 保持坐着、remain calm 保持冷静）；在随意的日常对话中会显得生硬。

  Please remain seated until the plane comes to a stop.

  请保持坐姿，直到飞机完全停稳。

Stay and remain both mean continuing to be in a place or state. Stay is the everyday, neutral word, used for location or staying with someone. Remain is more formal, often used in instructions, and often followed by an adjective, as in remain calm.

这两个词在“停留、继续处于某地”这个意思上很接近，但语体和使用场合不同：remain 更正式、书面化，常用于指令或被动结构；stay 更口语、日常，使用范围更广。