Everyone seems to have doubts about the flashlight in the little girl's hand. All I saw was a solar flashlight, so the little girl said 'It won't go out, as long as there is a day'. The translation I read says 'As long as I am in..' there is no context. It should actually be 'it won't go out as long as there is still daylight (ie sunlight)' because her flashlight is powered by solar energy.
Although the solar charger should not be so magical and can last so long, sometimes the movie does not need to be too rational to watch. According to the statement in the movie, this solar flashlight is estimated to last for about a night.
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