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RE: Stair climbing is a must for endurance,Take you to know different sports/爬楼梯会是增加耐力的必有运动，带你认识不一样的运动
Don't bet. I'm sure you can climb the stairs 30 times. Anyway, I'm OK.
Don't bet. I'm sure you can climb the stairs 30 times. Anyway, I'm OK.
Oh. I hope so