The oil slick appeared as a tangle of dull gray on the ocean surface, made visible to the satellite sensor by the sun's reflection on the ocean surface.
浮油区在海面上呈现为一团暗灰色,因为海面对太阳光的反射才使卫星传感器能够发现它。
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It is accurate to within 0.03mm. The same sensor is used on a boat to shine a beam off the tiller bar, using the reflection to measure the Angle of the rudder.