三防的英文：
three proofings

參考例句：
  • Defence equipments against nuclear,chemical and biological weapons
    三防裝備
three是什么意思：
num. 三，三個(gè)
  • three coat,three bake
    “三涂三烘” 工藝(反復(fù)涂三道漆，烘干三次的施工方法)
  • fiveteen contains five and three.
    15可被5和3除盡。
  • To draw three feet of water
    吃水三尺
  • It earned three Grammy Awards.
    它贏得三項(xiàng)格萊美獎(jiǎng)。
  • None of these three can be excluded.
    這三者缺一不可。
proofings是什么意思：
校對(duì); 防護(hù)
  • First proof: The earliest proof used for checking by proof readers.
    初稿:給校對(duì)員校對(duì)的最先稿樣。
  • Rough proof: Proof for identification rather than reading.
    粗稿樣:只用來辨認(rèn)，不作校對(duì)的稿樣。
  • Clean proof: A printer's proof in which there are no errors.
    清樣:沒有錯(cuò)漏的稿樣.
  • The proof is recoated with dichromate emulsion.
    將這張校樣重新涂以重鉻酸鹽乳劑。
  • A flow of words is no proof of wisdom
    口若懸河不能作為才智的證明。

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