tramping
不定期運輸
Tramp v. t. [imp. & p. p. Tramped p. pr. & vb. n. Tramping.]
1. To tread upon forcibly and repeatedly; to trample.
2. To travel or wander through; as, to tramp the country. [Colloq.]
3. To cleanse, as clothes, by treading upon them in water. [Scot.]