f

• Eq.(4) is solved for f and substituted in eq(5) .
  （4）式求得F并代入（5）式。
• A typical lens has a focal length(f)of 625 mm .
  常见镜头的焦距（f）为625毫米。
• a ring homomorphism f: a→b is finite.
  环同态f：AB叫做有限型的。
• The consonants " t " , " f " and " s " are voiceless .
  辅音“t”、“f”和“s”是不发音的。
• By unique factorization, the ideal(f)is prime .
  由唯一因子分解定理推出理想（f）是一个素理想。
• In a nonautonomous system, f is explicitly a function of t .
  在非自主的系统中，f是t的显函数。
• The number a is called a double root of the polynomial function f .
  数a称为多项式函数f的二重根。
• In other words, f respects addition, multiplication and identity element .
  换言之，F保持加，乘法和单位元。
• Under these circumstances, f is called a dissipation function for the set c .
  这时，称F为系统C的耗散函数。