phantom

n. 幻影,虚位,幽灵
a. 错觉的,幻影的,幽灵的

Have you heard the story of the phantom riders passing by in the night?

你听说过夜间飘过的幽灵骑士的故事吗？

Something apparently seen but having no physical reality; a phantom or an apparition.

幻影，幽灵明显可见但没有物质的实体；幻影或幽灵