7 . about ten billion tiny scales of skin rub off your body every day 7 .每天大約有100億片皮膚碎屑從你的身體脫落。
About ten billion tiny scales of skin rub off your body every day . in a lifetime , you could fill eight 2 . 5 - kilogram flour bags with dead skin 每天大約有100億片皮膚碎屑從你的身體脫落。你一生所蛻下的死皮,足以填滿8袋2