translation.en: But attached to the base of the wing is a set of little, tiny control muscles that are not very powerful at all, but they're very fast, and they're able to reconfigure the hinge of the wing on a stroke-by-stroke basis, and this is what enables the fly to change its wing and generate the changes in aerodynamic forces which change its flight trajectory.
translation.zh: 但附加到机翼的基部 是一套的小型的控制肌肉 这不是非常强大，但他们速度非常快， 他们就能够重新配置的机翼转轴 不断拍打的着 这使苍蝇能够改变它的翅膀 并在产生在气动力学上的变化 这改变其飞行轨迹