他们一次只做一步。
在她思路清晰的时刻，莉娅实现了一次重要的飞跃，克服了内心对改变的抗拒，并下定决心迈出更大一步。
In that moment of clarity Leah made an important leap, conquering her inner resistance to change and making a firm commitment to take bigger steps.
这个无名人士让人类的发展跨出了历史性的一步，因为正是在那一年，人类在其历史上第一次成为主要的城市物种。
This nameless person pushed the human race over a historic threshold, for it was in that year that mankind became, for the first time in its history, a predominantly urban species.
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