This allows you to make your checkout path a one-way process in which users cannot jump ahead until they've completed each step in turn.
这能让结帐过程成为单向过程，用户如果没能按顺序完成每个步骤，他将无法向前跳转。
For countries that have lagged behind for so long, the temptation to move ahead in one jump is hard to resist.
对于那些长期落后的国家，一跃而名列前茅的诱惑难以抵御。
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