The beauty of the fixed-wing design is that a propeller or jet engine provides the thrust, allowing a simple, strong wing structure, which merely has to provide the lift. Flapping wings in comparison are far more complicated because they have to do both. When a bird glides its wings provide lift the same way an aeroplane’s do. But when it flaps, it angles its wings so that as well as providing vertical lift, they also provide thrust to propel the bird forward.
📝 题目要求
找出文本中的逻辑关系词,并写出对应的逻辑类型
找出文本中的逻辑关系词；并写出所对应的逻辑类型：
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✅ 参考答案与解析
1. in comparison：对比 2. because：因果 3. But：转折 4. so that：因果 5. as well as... also...：并列 1. in comparison：对比（用于比较固定翼与扑翼两种设计的复杂程度不同。） 2. because：因果（解释扑翼“复杂得多”的直接原因——“它们必须同时做两件事”。） 3. But：转折（将“滑翔”与“扑翼”两种飞行状态进行对比，引出核心差异。） 4. so that：因果（表示鸟类调整翅膀角度的目的是为了达成后续的结果。） 5. as well as... also...：并列 （连接扑翼的两个功能：既提供升力，也提供推力，强调两者兼备。）