steppingstone

N ก้อนหิน ที่ วาง ให้ เหยียบ  kon-hin-ti-wang-hai-yiab

steppingstone

step ping stone |ˈstepiNGˌstōn ˈstɛpɪŋˌstoʊn | ▶noun a raised stone used singly or in a series as a place on which to step when crossing a stream or muddy area. • an undertaking or event that helps one to make progress toward a specified goal: the school championships are a steppingstone to international competition.