| 词汇 | tread |
| 词根词缀 | 词源： tread (v.) O.E. tredan (class V strong verb; past tense træd, pp. treden), from P.Gmc. *tredanan (cf. O.Fris. treda, M.Du. treden, O.H.G. tretan, Ger. treten, Goth. trudan, O.N. troða). The noun is recorded from early 13c., from the verb; in reference to automobile tires, it is recorded from 1906. Treadmill invented (and named) 1822 by William Cubitt of Ipswich, England; originally an instrument of prison discipline. |
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