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Source: Computational Materials Science, Volume 267
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林劍介紹稱，2025年，外國人出入境人次超過8200萬，同比上升26.4%，其中免簽入境人次同比上升接近50%。
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But questions remain about how realistic the goal and timeframe are, given recent and steep Nasa budget cuts, and some scientists are concerned that the plans are driven by geopolitical goals.