路易斯和布鲁克斯认为，当儿童不借助于观察偶然行为，也能通过视觉认出自己时，他们就达到了发育的一个重要里程碑。
Lewis and Brooks argued that an important developmental milestone is reached when children become able to recognize themselves visually without the support of seeing contingent movement.
美国海军Tim Dunigan上校说：“这将是濒海战斗舰编队一个重要里程碑。”
"This truly is a critical milestone on our road to success toward a full fleet introduction on Littoral Combat Ships," said Capt. Tim Dunigan, U.S. Navy.
2003年，中国与东盟宣布建立面向和平与繁荣的战略伙伴关系，这是东亚合作进程中的一个重要里程碑。
In 2003, China and ASEAN announced the establishment of the strategic partnership for peace and prosperity. This was a milestone in the East Asian cooperation process.
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