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汉语拼音：xiáng wù

1.古代遇有灾患病故或天象变异时﹐帝王及大臣皆脱下盛装换上素服﹐谓之"降物"。

1. 古代遇有灾患病故或天象变异时，帝王及大臣皆脱下盛装换上素服，谓之“降物”。

   《左传·昭公十七年》：“在此月也，日过分而未至，三辰有灾。於是乎百官降物。” 杜预 注：“降物，素服。” 孔颖达 疏：“降物谓减其物采也。《昏义》曰：‘日食则天子素服。’知百官降物，亦素服也。”《晋书·礼志上》：“灾祥之发，所以谴告人君，王者之所重诫，故素服废乐，退避正寝，百官降物，用币伐鼓，躬亲而救之。”

• Fallout shelters do not need to be specially constructed for protecting against fallout.

  防尘降物掩体不需要特别建造以保护你免于受尘降物的危害。

• Fallout from a nuclear explosion may be carried by wind currents for hundreds of miles if the right conditions exist.

  如果条件存在，核爆产生的放射性尘降物会随风漂移数百英里。

• Blasts that occur near the earth's surface create much greater amounts of fallout than blasts that occur at higher altitudes.

  接近地表的核爆炸会比发生在较高海拔的核爆炸产生更多的放射性尘降物。

• However, the amount of fallout will vary based on the size of the device and its proximity to the ground.

  然而，尘降物的数量会因核装置的大小以及爆炸时与地面的距离而不同。

• Decay rates of the radioactive fallout are the same for any size nuclear device.

  核辐射尘降物的衰减率不应核装置的大小而改变。

• 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。

• Find out from officials if any public buildings in your community have been designated as fallout shelters.

  向官方询问，找出在你居住的社区附近是否有符合防核辐射尘降物的公共设施。

• This fallout material decays over a long period of time, and is the main source of residual nuclear radiation.

  尘降物需要很长的时间才会衰减，这是核辐射残留的主要来源。

• The three factors for protecting oneself from radiation and fallout are distance, shielding, and time.

  距离，掩体，时间，可以使你自己免于辐射和放射性尘降物的危害。