How do Bike Gears Work? | Design Squad
619.2 هزار بار بازدید -
12 سال پیش
-
Get into gear and maximize
Get into gear and maximize your biking speed. Ready, set, go!
http://pbskids.org/designsquad/video/...
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http://pbskids.org/designsquad/video/...
For more videos, activities and games visit pbskids.org/designsquad
12 سال پیش
در تاریخ 1391/07/21 منتشر شده
است.
619,225
بـار بازدید شده