围巾样品要跨海参展。小树看到飞机，想知道它为何能持续飞行。Scarf samples must cross the sea for an exhibition. Mia wonders how an airplane can keep flying.
第 1 步：四种力同时作用Step 1: Four forces act together
先把飞机看成一个整体。Start with the whole airplane.
重量把飞机拉向地面。升力来自飞机与气流的相互作用。推力帮助前进，阻力阻碍运动。平直匀速飞行时，合力为零。Weight pulls an airplane downward. Lift comes from its interaction with airflow. Thrust drives it forward while drag resists motion. In steady, level flight, the net force is zero.
第 2 步：机翼让气流偏转Step 2: Wings turn airflow
升力从哪里来？Where does lift come from?
机翼周围形成压力分布。它也使周围气流改变方向。翼形、速度和迎角都影响升力。上下气流不必同时到达翼尾。A wing creates a pressure distribution around it and changes airflow direction. Shape, speed, and angle of attack affect lift. Air above and below the wing need not meet again at the trailing edge.
第 3 步：飞行是完整系统Step 3: Flight is a whole system
有升力就能安全飞到吗？Is lift alone enough for a safe trip?
飞机还需控制姿态与航向。发动机、结构和导航需要配合。天气和维护影响运行。航空进步来自长期试验与协作。An aircraft must also control attitude and direction. Engines, structure, and navigation work together. Weather and maintenance affect operations. Aviation developed through sustained testing and collaboration.
🎮 机制实验室：观察，再判断🎮 Mechanism lab: observe, then decide
只比较竖直方向：升力减重量。合力为零表示竖直加速度为零，不等于一定静止。Compare the vertical direction: lift minus weight. Zero net force means zero vertical acceleration, not necessarily rest.
一句话记住它：Remember it:飞机靠气动力飞行，靠完整系统可靠运行。Aerodynamic forces support flight; a complete system supports reliable operation.
重量把飞机拉向地面。Weight pulls an airplane downward.机翼周围形成压力分布。A wing creates a pressure distribution around it and changes airflow direction.飞机还需控制姿态与航向。An aircraft must also control attitude and direction.
基础力学：较高把握。图只讲平直飞行，实际操纵须专业训练。High confidence in basic mechanics. The diagram addresses level flight; operating an aircraft requires professional training.
核对日期：2026 年 10 月 6 日。文字与配图由 AI 生成；已做来源核对及程序测试，待人工复核。Checked 6 October 2026. Text and illustrations are AI-generated. Sources and software checks were performed; human review is pending.
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