This is indicated by the light bulb when the cursor is set to the field.
当光标进入该字段时，此功能通过电灯泡图标来指示。
A small red light indicated that it was already running.
一点小小的红光显示着它一直开着。
The light above the elevator indicated that the elevator was then at the fifteenth floor.
电梯上方的灯指示那时电梯在十五楼。
The light above the elevator indicated that the elevator was then at the fifteenth floor.
电梯上方的灯指示那时电梯在十五楼。
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