就在我即将穿越美国边境时，我面临了最大的挑战。
It was when I was about to cross the U.S. border that I faced my greatest challenge.
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cross英 /krɒs/|美 /krɔs/
解释
cross 是动词，意思是"穿过、横越"，指从一边移动到另一边，通常指穿过道路、边界等线状障碍物。
It was when I was about to cross the U.S. border that I faced my greatest challenge.
cross 是动词，意思是"穿过、横越"，指从一边移动到另一边，通常指穿过道路、边界等线状障碍物。
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