三防的英文：
three proofings

参考例句：
  • Defence equipments against nuclear,chemical and biological weapons
    三防装备
three是什么意思：
num. 三，三个
  • three coat,three bake
    “三涂三烘” 工艺(反复涂三道漆，烘干三次的施工方法)
  • fiveteen contains five and three.
    15可被5和3除尽。
  • To draw three feet of water
    吃水三尺
  • It earned three Grammy Awards.
    它赢得三项格莱美奖。
  • None of these three can be excluded.
    这三者缺一不可。
proofings是什么意思：
校对; 防护
  • First proof: The earliest proof used for checking by proof readers.
    初稿:给校对员校对的最先稿样。
  • Rough proof: Proof for identification rather than reading.
    粗稿样:只用来辨认，不作校对的稿样。
  • Clean proof: A printer's proof in which there are no errors.
    清样:没有错漏的稿样.
  • The proof is recoated with dichromate emulsion.
    将这张校样重新涂以重铬酸盐乳剂。
  • A flow of words is no proof of wisdom
    口若悬河不能作为才智的证明。

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