1.natural barrier
天险收藏指正
2.take advantage of a natural barrier to put up a strong defence
据险固守收藏指正
3.The Sahara desert is a natural barrier between north and central Africa
撒哈拉沙漠是北非与中非之间的天然屏障收藏指正
4.In a cross-country race, the driver contests the multi-circle race in a close in track. He needs to get over a complicated topography of natural barrier including steep slopes, turns, rough roads, roads covered with stones,sands, earth steps, roads in the woods, marshes and muddy roads etc.natural landforms.
越野赛，车手是在封闭线路上进行多圈竞赛，需要越过天然障碍的复杂地形，包括上下陡坡、左右转弯、起伏路、石子路、沙地、土坎、林间路、沼泽地、泥泞路等天然地貌。收藏指正
5.The coastal area of Belize is an outstanding natural system consisting of the largest barrier reef in the northern hemisphere, offshore atolls, several hundred sand cays, mangrove forests, coastal lagoons and estuaries.
伯利兹的海岸是北半球最大的堤礁自然生态系统，它由近海环礁、几百个沙洲、美洲红树林、沿海泻湖、港湾等组成。收藏指正
6.The results indicated that polysaccharide, in combination with plasticizer, intensity assistant, lipid, emulsifier and natural antiseptic agent ,produced films with beneficial effects, such as, good water vapor barrier, certain mechanical strength, health benefits, when they were dried at 40 ℃ for 1 h.
结果表明:以葡甘露聚糖为膜基材,用增塑剂、补强剂、脂质、乳化剂和天然防腐剂作为辅料,在40℃条件下烘干1h,可得到具有良好阻湿阻气性能、一定强度和保健防腐的保鲜仿生材料。收藏指正
7.Paint protection products (waxes by any other name), whether they are based on natural ingredients or synthetic ingredients (or a blend of both) provide a protective film, or Sacrificial Barrier (as mentioned above) against Mother Nature and other detrimental or corrosive substances.
漆面护理产品（蜡也可叫其它名字），它们是否是天然成分或合成的成分（或一种组合）可使漆面平滑或替换作用（正如刚才提到的）自然的力量和其它有害的物质或者有腐蚀性的物质。收藏指正
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