crossing boundary的用法和样例：
例句
- As Las Vegas Sands struggled to raise capital, construction was curtailed and the number of workers crossing the border began to fall.
由于拉斯维加斯金沙集团难以筹集到资金，建筑项目缩减了，穿越边界的工人数量也开始下降。 - A small number of wounded Palestinians has crossed from Gaza into Egypt and some medical supplies have come in from Egypt via the Rafah border crossing.
一小批受伤的巴勒斯坦人已从加沙穿越边界进入埃及，一些医疗物资也已通过拉法赫过境点从埃及进入了加沙。
