fluid

The mechanic checked the level of the brake fluid to ensure the car could stop safely.

(Chinese) 技工检查了制动液的液位，以确保汽车能够安全停止。

Doctors recommend drinking plenty of fluids, such as water or juice, when you have a fever.

(Chinese) 医生建议发烧时多喝液体，如水或果汁。

The gymnast's fluid movements on the balance beam earned her a gold medal.

(Chinese) 体操运动员在平衡木上流畅的动作使她获得了一枚金牌。

The brushstrokes in this painting are so fluid that the river seems to be moving.

(Chinese) 这幅画中的笔触非常流畅，以至于河流看起来像是在流动。