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（单词翻译）
Sleepy teenagers
Vocabulary
battleground
a place where conflicts or fights take place
to surface
to wake up
sensors
devices that can recognise movement
monitored
watched or checked
analysis
detailed study
consistently
repeatedly
British Summer Time
a time zone in the UK where clocks are put forward by an hour in summer to make the most of the daylight hours
secretion
the process by which a liquid or a chemical is released by the body
hormone
a chemical produced in the body that influences how the cells and tissue function
sleep deprivation
lack of enough sleep
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