1. To form the positive, comparative, or superlative degree of(an adjective or adverb). 
   构成构成（一个形容词或副词）的原级、比较级或最高级
2. a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion. 
   一个原子失掉一个电子来形成一个正离子，另一个原子得到一个电子来形成一个负离子的化学键。
3. The reaction to their singing was so positive that they decided to form a band as soon as they had finished their exams at school. 
   观众对他们的演唱反应十分积极，他们因此决定学校的考试一完就组建乐队。
4. A positive answer; positive criticism. 
   肯定的回答；肯定的评论
5. Exert yourself so that you keep your body in shape.Mental ailments can easily spring form physical ones,and your body,like your mind,must be kept active to remain positive. 
   使自己多多活动以保持自己的健康状态，生理上的疾病很容易造成心理的失调，你身体应和你的思想一样保持活动，以维持积极的行动。

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• 1. 正双线性形式
  分段双线性函数 positive bilinear form...正双线性形式 rank of a bilinear form...双线性形式的秩 reciprocal bilinear form
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