Internet shopping makes buying things easier, but has also led to the rise of a new kind of thief: the porch pirate.
网络让购物变得更加容易，但也导致了一种新型偷窃的兴起：包裹窃贼。
Porch pirates scour door steps for deliveries that have been made when a householder was out, and nab them.
包裹窃贼会在住户外出时，在门口的台阶上搜寻投送的快递，然后把快递劫走。
Sometimes, they will stalk delivery vans to do so.
有时他们会跟踪送货车进行偷窃。
Residents of New York City, for example, lose an astonishing 90,000 parcels every day to porch pirates,
例如，根据《纽约时报》的报道，纽约市的居民每天因包裹窃贼
according to a report in the New York Times
而丢失多达9万个包裹。
Porch piracy is a problem that may be solved by the spread of parcel-delivering drones.
无人送货机的普及或许可以解决包裹窃贼的问题。
Because each drone delivery involves a separate journey, rather than having to be fitted into a round,
因为每一架无人机都直送一家货物，而不是来回运送多家，
it will be easier for courier and customer to agree on when a drone should arrive than on the arrival time of a van.
所以快递员和客户更容易就送货时间达成一致，而不是货车何时到达。
However Nirupam Roy and Nakul Garg, a pair of engineers at the University of Maryland,
但是，马里兰大学的两位工程师Nirupam Roy和Nakul Garg。