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（单词翻译）
Electronics 'affect bird navigation'
Vocabulary
remarkable
amazing
compass
device to establish position which has a needle always pointing north
mains electricity
system of wires which carries electricity into a house
satnav
system of computers and satellites used to establish location
found their bearings
discovered their exact position in their journey
back-up
device or system kept as a reserve to be used if the main system fails or extra help is needed
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