if and only if

基本解釋

• 若且唯若，當(dāng)且僅當(dāng)

英漢例句

雙語(yǔ)例句

• To see this yourself, design a small test program that will compile if and only if the desired condition is true.
  為了能切身體會(huì)，您可以設(shè)計(jì)一個(gè)小測(cè)試程序，這個(gè)程序當(dāng)且僅當(dāng)期望的條件得到滿足時(shí)才可以編譯。
• Eye of newt goes into the little black bag, if and only if there isreproducible scientific evidence that it works.
  把蠑螈眼放入黑色的小袋子，當(dāng)且僅當(dāng)有重復(fù)性的科學(xué)證據(jù)表明它的實(shí)用性）。
• Whenever you hear the word If, then, and, or, not, If and only if, all these logical words, all, is, lovely logical words, you've got to be sensitized this week because I want to hear you.
  不管什么時(shí)候你聽(tīng)到了如果，那么，和，或者，不，如果和只有當(dāng)，這些邏輯詞的時(shí)候，所有，是，很可愛(ài)的邏輯詞，你這周要很敏感，因?yàn)槲蚁肼?tīng)到你們。

原聲例句

• If you start a path of one color you must continue to use only toe and handholds marked with that color.
• If you're pure, not only are meats and viands pure , but all kinds of knowledge, whether of good and evil.
  如果你純潔，不只是肉和食物，肉和酒會(huì)變得純潔，所有的只是，無(wú)論善惡都會(huì)變得純潔。
  耶魯公開課 - 彌爾頓課程節(jié)選
• It's as if the commodity of the bride is deemed truly valuable only if it can be guaranteed pure and untouched.
  這就好像新娘這件商品,只有在完全的純凈沒(méi)有動(dòng)過(guò)才是有真正價(jià)值的。
  耶魯公開課 - 彌爾頓課程節(jié)選

權(quán)威例句

• From an evolutionary viewpoint, a function can be assigned to a DNA sequence if and only if it is possible to destroy it.
  FORBES: ENCODE Papers Get A Fisking

• if and only if更多例句

詞組短語(yǔ)

短語(yǔ)

• iff if and only if 有而且只有
• If -and-only-if 定義與“當(dāng)且僅當(dāng)
• IF -AND-ONLY- gate 若且唯若閘;等同門;翻譯
• And Only If 且僅當(dāng)
• if and only if 當(dāng)且僅當(dāng)

• if and only if更多詞組

專業(yè)釋義

數(shù)學(xué)

• 當(dāng)且僅當(dāng)

  It is proved that a graph G is a bipartite graph if and only if every odd-order princpal minor of the adjacecy matrix A (G) of G is singular.
  本文證明了：圖G是二部圖當(dāng)且僅當(dāng)其鄰接矩陣A（G）的任一個(gè)奇階主子陣是奇異陣。

  計(jì)算機(jī)科學(xué)技術(shù)

• 若且唯若