surface visibility

例句：

1. 1. The aircraft's surface visibility is measured inkilometers.
   飞机的表面可见性以公里为单位测量。
2. 2. The pilot must ensure that the surfacevisibility is sufficient for safe landing.
   飞行员必须确保表面可见性足够安全降落。
3. 3. The weather forecast shows good surfacevisibility for the next few days.
   天气预报显示未来几天有良好的表面可见性。