" Fluid" (fluid) normally means to be moving in an elegant and graceful way, if we're talking about a person.

如果我们谈论的是一个人，“流体”（fluid）通常意味着以优雅和优雅的方式移动。

His air, his manner, his deportment all mark that elegant and graceful sense of his own superiority, which those who are born to an inferior station can hardly ever arrive at.

他的神态，他的举止，他的举止，无一不彰显着他那种儒雅的优越感，这是出身低微的人所难以企及的。