"lever worked by foot," c. 1400, from Old English tredel "step, stair, sole of the foot," from tredan "to tread" (see tread (v.)) + instrumental suffix -el (1). Compare handle (n.).
实用例句
1. She was working the treadle of her sewing - machine.
她正用脚踩动缝纫机的踏板.
来自《简明英汉词典》
2. Drag onto the page. Right - click to make a treadle, or to resize.
