Dolphin skin is very smooth., 海豚的皮膚非常光滑。, smooth, 滑的, It helps them swim fast in the water., 這能幫助牠們在水中快速游泳。, Dolphins also lose their old skin often and grow new skin., 海豚也常常脫掉舊皮膚並長出新皮膚。, lose their old skin, 失去他們的老舊皮膚, They change their skin every two hours., 牠們每兩個小時就會換一次皮膚。, This keeps their bodies healthy and clean., 這能讓牠們的身體保持健康與乾淨。, healthy, 健康的, Answer the questions., Is your skin smooth?.

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