stepping stone
A stone that can be stepped on in crossing something, especially a marsh or creek. / (idiomatic) Something used as a way to progress to something or somewhere else.
(Indology) A pillar or column.
(number theory) A prime number that becomes a different prime when its decimal digits (or digits in some specified other base) are reversed.
plural of Ewalt
彼は泥だらけの小川を渡るために、踏み石から次の踏み石へと慎重に足を進めた。
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