The mountain biker adjusted his gears to climb the steep trail.
山地自行车手调整齿轮以攀爬陡峭
小路。
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训练—讲座/谈话
14 Major types include stratovolcanoes which often appear as tall steep mountains, shield volcanoes which are flatter and dome-shaped, calderas which are large depressions in the ground and mid-ocean ridges which are underwater chains of volcanic mountains.
层状火山,
常看起来像陡峭的高山;盾状火山,平坦呈圆顶状;火山口,地面上的大洼地;大洋中脊,海底的火山山脉。