北斗系统时间基准（北斗时），溯源于协调世界时，时差信息在导航电文中发播；
The BDT is related to the Coordinated Universal Time, and the time bias information is broadcast in the navigation message.
去年夏天，当中国人民在南方抗洪时，北斗帮助测量了洪水的涨落。
Last summer, when Chinese people fought the flood in the South, Beidou helped measure the rise and fall of the flood water.
更重要的是，当人们处于危险之中而手机又没有信号时，他们可以使用北斗发送一条1200字的信息寻求帮助。
What's more, when people are in danger and there is no mobile phone signal, they can use Beidou to send a 1200-word message to ask for help.
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