在这起事故中，低劣的控制室指示器指引电站工作职员封闭了为反应堆芯堆降温的回路。
In that case, poor control room indicators led plant officials to switch off the circuit which would have cooled the reactor core.
该指示器可以是经历化学反应以改变颜色的盘或者是翻转以显示具有不同颜色的侧面的浮标。
The indicator may be a disk that undergoes a chemical reaction to change color or a float that flips over to reveal a side having a different color.
植物物候则是反应气候变化最好的指示器。
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