求翻译：（1）受自然条件影响较大，内河航道和某些港口受季节影响较大，冬季结冰，枯水期水位变低，难以保证全年通航。而空运具有高速直达性，因为空中较少受自然地理条件限制，航线一般来取两点间的最短距离。是什么意思？

(1) under the influence of natural conditions is large, inland waterways and ports under the influence of seasonal large, frozen in winter, dry season the water level is low, it is difficult to guarantee navigation for the whole year. Air with high-speed direct access to, because the air less limite

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(1) receives the natural condition influence to be big, the inland river route and certain harbors are been big the season influence, the winter ices up, the dry season water level changes low, guaranteed with difficulty%

(1) under the influence of natural conditions is large, inland waterways and ports under the influence of seasonal large, frozen in winter, dry season the water level is low, it is difficult to guarantee navigation for the whole year. Air with high-speed direct access to, because the air less limite