这张沙发装了脚轮，移动起来很方便。

This sofa has ___casters attached, making it easy to move around.

请把调味瓶递给我，我要在薯条上加些盐。

Pass me the ___caster, I need to sprinkle some salt on the fries.

这位铁匠是一位熟练的浇铸工，能精准地控制金属液体的流动。

The blacksmith is a skilled ___caster who can precisely control the flow of molten metal.