Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.
要不是重力使箭掉落地上，它将会一直沿直线往前飞行。
Although the engines are extremely reliable, one could fail, and the plane could continue to fly safely with that remaining single engine.
尽管引擎是极为可靠，就算其中一个引擎发生故障，飞机使用剩余的一个引擎也能继续安全飞行。
Although the engines are extremely reliable, one could fail, and the plane could continue to fly safely with that remaining single engine.
尽管引擎是极为可靠，就算其中一个引擎发生故障，飞机使用剩余的一个引擎也能继续安全飞行。
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