Balloon is inflated, generally have three choices: into the air, the balloon does not float up (recommended); into the balloon, the balloon can float up, hydrogen cost is relatively low, but with a certain degree of risk, be sure to stay away from the balloon into the balloon fire in order to avoid danger (not recommended); filled with helium, helium is an inert gas, relatively safe, but the cost is relatively high, make a reasonable choice under the circumstances filled with helium (highly recommended). Children pay attention to safety.
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