1·Cross a frontier without adjusting and you can be in deep trouble.
不进行调整就跨越边界，你可能会遇到大麻烦。
2·It wasn't difficult then to cross the frontier.
那时候穿越国界并不难。
—— 《柯林斯英汉双解大词典》
3·That is because of the treaty which we have made. On forming our little Holy Alliance we assigned ourselves each our frontier, which we never cross.
这是因为我们有这样一条规定，在组织我们这个小小神圣同盟时，我们便划定了边界，互不侵犯。
4·repeatedly transporting persons to illegally cross the national border (frontier), or transporting a large number of persons;
多次实施运送行为或者运送人数众多的；
5·Although China and India could devote their considerable intellectual resources to solving the problems faced by economies on the technological frontier, why cross that bridge until you reach it?
尽管中国和印度能够投入他们可观的智力资源来解决经济在技术前沿遇到的经济问题，那为什么不在碰到问题时再跨越这座桥呢？
6·You fumble to find your passport when you cross a frontier.
当你出境时，要摸索着寻找护照。
7·Researchers currently estimate Voyager 1 will cross that frontier in about four years.
目前研究人员估计旅行者号将在大约四年后到达这一边界。
8·Ernesto Guevara DE la Serna: What do we leave behind when we cross each frontier?
格瓦拉：当我们穿过每一道边境的时辰留在我们死后的是什么？
9·They no sooner cross a frontier than they are scouting the next.
他们刚刚跨越一个新领域就开始探索下一个更新的领域。
10·To cross the border (frontier) family of crime shows, regional, international and professional characteristics, and showed a high run trend.
偷越国(边)境犯罪呈现出家族化、区域化、国际化和专业化特点，并呈现出高位运行态势。