The border crossing is a dry river bed and a bridge.
边界是一条干涸的河流，河上有一座桥。
While I was crossing the bridge, a blast blew my cap into the river.
当我正从桥上经过的时候，一阵风把我的帽子吹到了河里。
He lost his balance when crossing the bridge and fell into the river.
过桥的时候因失去了平衡而掉进了河里。
In crossing the bridge, she dropped the door key in the river.
过桥时她把钥匙扔进了河里。
In crossing the bridge, she dropped the door key in the river.
过桥时她把钥匙扔进了河里。
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