为

• He's always fighting other people's quarrels .
  他总为别人打抱不平。
• Why have you marked the sentence wrong ?
  你为什么把那句话标为病句呢？
• We call this factor the extent of reaction .
  我们称此因子为反应度。
• He instantly regretted his words .
  他顿时为自己刚才说的话懊悔起来。
• This recipe will be enough for four servings .
  本食谱为四人食用分量。
• Our room this year is furnished in red .
  今年我们的房间以红色为基调。
• Fishing is still the main industry there .
  捕鱼业仍为那里的主要行业。
• When shall i cease to regret you ?
  什么时候我会不再为你感到惋惜呢？
• Nelly, will you keep a secret for me ?
  耐莉，你能为我保守一件秘密吗？