场上竞赛区（Competition Area）的颜色必须与警告区（Warning Area）的颜色有明显的区别。
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... warm-up time 暖机时间 warning area 警示区 warning device 警告装置 ...
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end warning area 终端警告区 ; 结束警告区
air space warning area 空域警戒区
airspace warning area [航] 空间警告区域
Minimum Length of Warning Area 警告区最小长度
end of warning area 告警区域末端
Storm Warning Area 警报区
early warning area 预警域
navigation warning area 航行警告区
forward area warning station 前方警戒雷达站
What should be the scope of the warning area?
应该设置多大范围的警戒区呢？
youdao
Historically, the AAII poll is considered to be in its warning area when bullishness reaches above 50% and bearishness drops below 20%.
FORBES: February Deserves Its Bearish Reputation
New Orleans was not in the warning area, however.
MSN: Tropical Storm Debby forms in Gulf; Louisiana warned
Hapag-Lloyd said a general travel warning for the area, issued by the German Foreign Ministry, played a part in the decision.
CNN: German cruise ship to fly passengers over pirate hotspot
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