因为这样的技术必须精确人的位置才可以工作，而目前卫星的定位系统还不能运行到室内。
They have to be able to pinpoint people in order to work, but satellite positioning does not work indoors.
自2006年，整个地区的海啸预警系统就已经建立并投入运行，但是要想及时和精确地向可能有危险的地区传达信息依然是一个难题。
A regional tsunami early-warning system has been up and running since 2006. But getting timely and accurate information to imperiled communities is problematic.
电流互感器作为电力系统中的重要设备，对电力系统的正常运行和电力的精确计量有非常重要的作用。
As very important equipments in electric power industry, current transducers (ct) play a primary role for working well and calculating precisely in power supplying system.
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