But recent data from light-level geolocators show that terns actually travel more than twice as far each year, possibly to take advantage of prevailing winds.

但最近来自光级地理定位仪的数据显示，燕鸥实际上每年的旅行距离是原来的两倍多，可能是为了利用盛行风。

The researchers used clear plastic cord -- designed for making beaded jewelry -- to fashion tiny flycatcher harnesses, each bearing a geolocator tag.

研究人员使用专为制作串珠首饰而设计的透明塑料绳来制作微型捕蝇器吊带，每根吊带上都带有地理定位标签。

When the birds flew south for the winter, the geolocator tags regularly recorded the light levels and the time, allowing the scientists to estimate each bird's approximate latitude and longitude.

当鸟儿飞往南方过冬时，地理定位标签会定期记录光照水平和时间，使科学家能够估计每只鸟的大致纬度和经度。

They recovered 17 geolocator tags but just five GPS tags -- and three of the GPS tags failed, providing no data at all for reasons the scientists still do not understand.

他们恢复了 17 个地理定位器标签，但只恢复了 5 个 GPS 标签，其中 3 个 GPS 标签失败了，根本没有提供任何数据，原因科学家们仍然不明白。