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After filling an empty water bottle with stones, a professor took out a box of pebbles and poured them into the water bottle. He gently
2019年8月1日
Al 15 jaar focus op hoogwaardige waterfles
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Al 15 jaar focus op hoogwaardige waterfles
After filling an empty water bottle with stones, a professor took out a box of pebbles and poured them into the water bottle. He gently
A professor picked up a cup with water and asked the audience, "Guess how heavy is this cup?" "50 grams." "100 grams." "125 grams." Everyone
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