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They also warn that because this is the first study to ever examine the relationship between school start times and student retention in pre-adolescents, more research is needed before solid conclusions can be drawn.
Original Video：
Why Schools Should Start Classes Later!
Key Vocabulary
1. examine
examine
[ɪɡˈzæm.ɪn] (v.)
2. retention
retention
[rɪˈten.ʃən] (n.)
3. pre-adolescent
pre-adolescent
[priː-ˌæd.əˈles.ənt] (n.)
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