Although such a cloud would pose virtually no threat while in the upper atmosphere, the fallout at the ground of radioactive particles from it should be a concern for any monitoring authority.
虽然这种云在高层大气中几乎不构成任何威胁，但是它在地面散发出的放射粒子的余波应该是任何监管机构所关注的。
Monitoring can project the fallout arrival times, which will be announced through official warning channels.
监测设施能够投射出放射性尘降物的到达时间，然后通过官方的警示渠道发布。
Monitoring can project the fallout arrival times, which will be announced through official warning channels.
监测设施能够投射出放射性尘降物的到达时间，然后通过官方的警示渠道发布。
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