他们在鸽子背后放置微型跟踪设备和摄像机，然后运用全球定位系统追踪它们的行动。
They put tiny tracking devices and cameras on the birds' backs and then followed their movements using global positioning systems.
科学家们花费了10年来研究鸽子。他们在鸽子背后放置微型跟踪设备和摄像机，然后运用全球定位系统追踪它们的行动。
The scientists spent 10 years studying pigeons. They put tiny tracking devices and cameras on the birds' backs and then followed their movements using global positioning systems.
科学家们花费了10年来研究鸽子。他们在鸽子背后放置微型跟踪设备和摄像机，然后运用全球定位系统追踪它们的行动。
The scientists spent 10 years studying pigeons. They put tiny tracking devices and cameras on the birds' backs and then followed their movements using global positioning systems.
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