blacking signal中文什么意思

例句与用法

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1. special actions to be taken for red black signal
   红黑色暴雨警告信号发出时，特别注意事项
2. if the red black signal is issued when some students have set out for school-
   如红/黑色暴雨警告信号发出时，学生已经离家上学：
3. the observatory will endeavour to issue the red and black signals before the specified rainfall levels are reached
   天文台争取在降雨量到达指定水平前，发出红色和黑色信号。
4. the observatory will endeavour to issue the red and black signals before the specified rainfall levels are reached
   天文台争取在降雨量到达指定水平前，发出红色和黑色信号。
5. the amber signal gives alert about potential heavy rain that may develop into red or black signal situations
   黄色信号提醒市民将有大雨并可能进一步发展至红色或黑色暴雨情况。