lack

• Our derivation lacks rigour in this regard .
  我们的推导在这方面是不严格的。
• Lack of food may stunt the body .
  缺乏食物会阻碍身体的发育。
• Many of his poems lack polish .
  他的诗作有许多是不够精练的。
• This article lacks unity and coherence .
  这篇文章层次不清。
• Her lack of experience was a disadvantage to her .
  她缺乏经验，这对她很不利。
• She lacks the indefinable charm of weakness .
  她缺少那种难以形容的软弱的媚态。
• He lacks all soldier-like qualities .
  他全然缺乏军人气质。
• They lack the motivation to study .
  他们缺乏学习的积极性。
• But what it lacks in speed it gains in stamina .
  它虽然行动缓慢，但却很有耐力。
• It is a lack that should be remedied .
  这是疏忽，得补救。