A bar with adjustable weights at each end, lifted for sport or exercise.
杠铃两端重量可调节的棒, 运动或锻炼时用来举重
An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
挡板, 调节风门一种可调节的薄片, 如在熔炉或火炉的通气管中的, 用来控制气流
A machine that runs on the energy generated by a wheel of adjustable blades or slats rotated by the wind.
风车靠风力旋转带有可调节的叶片或梯级横木的轮子所产生的能量来运转的一种机器
