短语讲解：
1. Although customs generously returned the watch to the buyer and let her get onboard with the watch, the guilty traveler would not be allowed to enjoy the offshore tax-free policy in the next three years.
allow to允许某人做某事
例句：Allow me to introduce you to our headmaster.
请允许我介绍你见见我们的校长。
2. In order to carry out the offshore duty-free policy in an effective way, the local customs have installed many cameras at the duty-free stores and the departure hall of the airport.
in order to为了
例句：We started early in order to arrive before dark.
为了在天黑前到达,我们很早就动身了。
carry out执行; 贯彻
例句：He carried out the plan in very detail.
他一丝不苟地执行那项计划。
3. When flights are delayed or canceled and need to leave the departure hall, travelers are expected to leave the duty-free items at duty-free store, and get them back before getting onboard.
be expected to预计
例句：House prices are expected to perk up.
预计房价会上涨。
get back找回, 取回
例句：I haven't got back the book I lent him.
我还没有收回我借给他的那本书。
4. At the airport, some travelers take four or five cartons of cigarettes when they pass through customs while only one is allowed.
pass through经历;通过
例句：He had passed through many difficulties during the experiments.
在试验时他经历了许多困难。
