You can add the fluid to the powder, or, conversely, the powder to the fluid.

可把液体加入粉末，或者相反，把粉末加入液体。

《牛津词典》

We set up the leg pattern in the first sequence then add in fluid, relaxed arm movements.

在第一组中我们设定了腿部形态并加入了流畅放松的手臂动作。

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You can add the fluid to the power or, conversely, the powder to the fluid.

可以将液体加到粉末里，或者相反，将粉末加到液体里。

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