The warning marker includes solar cells, storage batteries and electrical circuit apparatus for selectively illuminating the light elements during low ambient light and nighttime conditions.
警示器包括太阳能电池，蓄电池，以及在环境低照度和晚间用以发光元件选控的电路器件。
The warning marker includes solar cells, storage batteries and electrical circuit apparatus for selectively illuminating the light elements during low ambient light and nighttime conditions.
警示器包括太阳能电池，蓄电池，以及在环境低照度和晚间用以发光元件选控的电路器件。
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