第二条本办法所称气球，包括无人驾驶自由气球和系留气球。

Article 2 balloons as mentioned in these Measures shall include unmanned free balloons and captive balloons.

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无人驾驶自由气球，是指无动力驱动、无人操纵、轻于空气、总质量大于4千克自由漂移的充气物体。

An unmanned free balloon shall refer to a freely drifting inflatable object which is driven with no power, is piloted by nobody, is lighter than air, and whose gross mass is more than 4 kilograms.

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