The stone was lifted by means of a rope and pulley.
这块大石是
子和滑轮给吊起来的。
带轮
滑轮升起
带轮;
带盘
动机
带轮
带轮The stone was lifted by means of a rope and pulley.
这块大石是
子和滑轮给吊起来的。
The worker threaded the wire through the pulley.
工人把金属丝穿在滑轮上。
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