A balloon filled with water in the hands of people may be just a small ordinary toy. It brings a game and a joy to people. However, a raindrop filled with harmful substances can bring great harm to people. In fact, not all rain has a positive effect on plants and animals, such as acid rain, which can corrode all life on earth and leads to a terrible existence. Balloons and raindrops are extremely common substances on earth, often around us, but we never realize that danger is also around us at the same time.

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