null-null

常見例句

• The state or quality of being null.
  無效無效的狀況或性質(zhì)
• The act of making null and void.
  廢除使 ... 作廢和無效
• The contract was null and void because it was not signed.
  這個合同無效，因為它尚未簽字。
• The court ruled that the claim was null and void.
  法庭裁決此項要求無效。
• The marriage was declared null and void.
  婚姻已宣告無效了。
• The null subset corresponds to the term 1.
  空集則對應(yīng)于常數(shù)項1。
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