1) getting harder and harder; become difficult step by step
一步比一步难
2) 1-step add-compare-select
一步"加-比-选"
5) The first step is the only difficulty.
迈出第一步是最艰难的。
6) take a step (a few steps, etc.)
走一步(几步)
补充资料：比选
1.考校选择。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条