speed pulley的用法和樣例：
例句
- The belt started wrapping up on the tractor pulley.
皮帶開(kāi)始繞在拖拉機的皮帶輪上。 - Attach the pulley which is held by hand with screws.
用螺絲安裝皮帶輪的手持部分。 - The lifting device is a system of rope and pulley.
這種起重裝置是由纜索和滑輪組成的。 - A single fixed pulley does not help to save effort.
一個(gè)單獨的固定的滑輪不能幫助節省氣力。
