They were almost completely cut off from the outside world.
他们几乎完全与外界绝缘了。
2.at some point 在某个时刻
At some point kids start doing things they didn't use to do. They get more independent
从某个时候起，孩子们开始做以前不曾做的事情。他们变得更加独立。
3. lay out 说明
Maxwell listened closely as Johnson laid out his plan.
马克斯韦尔仔细听着约翰逊讲解其计划。
4.ports of entry 入境口
Airports have joined seaports as ports of entry for the visiting foreigner.
机场和海港一样成为来访的外国人的入境关口。
5.cross-border 跨国的
Currency-conversion costs remain one of the biggest obstacles to cross-border trade.
货币兑换成本仍是跨境贸易的最大障碍之一。
