照翻译
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dvegetablelifewhichformsalargepartofthefoodforfishes地球表面是大面积的陆地和比陆地面积更大的水域。我们先来看看水域。水面积大约是陆地面积的三倍;非常广大的独立的水域称为“洋”,小一些的叫做‘海”。人们发现大洋大海里的一部分水会朝着某一个方向流动,也就是说,从发生这种流动的海洋的一个区域流向它的另一个区域。这样流动的水体人们称作“洋流”。海洋里有成千上成万洋流,但人们只给若干较强大、较显著的洋流作专门命名。这些洋流十分重要;之所以重要不仅是因为它影响到其流经地附近的气候,还因为它们夹带的大量微生物和植物,是鱼类重要的食物来源。The
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ow地球陆地表面的自然形态和特征的地域差别很大。有些地域的地表形态多以高山深谷为主.而另一些地域则大部是平原。如果你到世界各大陆作一番旅行,你会看到地表的各种形态:山脉、平原、高原、沙漠、热带雨林,还有被冰雪永久覆盖的空旷的野地。Whe
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dasarulethebetterwelikethosepeoplethemselves当我们思考认识这个世界时,不应忘记我们的世界是各种各样人群的家园,他们具有不同的肤色,过着不同的生活,还有各自不同的对诸如宗教、政府、教育、社会行为等重要问题的看法。不同人群的生活环境使我们的生活方式彼此有很大不同。我们的任务应该是了解那r