internal sensitivity speck

例句：

1. 1. The bird's feathershave speckles of brown on them.
   这只鸟的羽毛上有棕色的小点。
2. 2.The map had several speckles ofink on it.
   地图上有几处墨迹斑点。
3. 3. The old painting has manyspeckles that are difficult to see.
   这幅旧画有很多难以察觉的斑点。