皮风箱 meaning in English

leather bellows
molders bellows
moulder's blower

In the background , a tiny apprentice blows a big charcoal fire with a huge leather bellows worked by a string attached to his big toe - - the red of the live coals glowing , bright and then dimming rhythmically to the strokes of the bellows
铺子的后边，还有一个小不点儿的徒工在那里用一根拴在大脚趾上的绳子鼓动着一个巨大的皮风箱，煽着一大炉炭火? ?燃烧着的木炭随着风箱的鼓动而有节奏地变得忽明忽暗。