warm up
  暖起來,活躍起來
  warm up /(ˈ)wɔrˈməp/ 不及物動詞
  預熱,加熱,熱起來
  warm up
       v 1: run until the normal working temperature is reached; "We
            warmed up the car for a few minutes"
       2: become more friendly or open; "She warmed up after we had
          lunch together"
       3: get warm or warmer; "The soup warmed slowly on the stove"
          [syn: warm]
       4: cause to do preliminary exercises so as to stretch the
          muscles; "The coach warmed up the players before the game"
       5: make one's body limber or suppler by stretching, as if to
          prepare for strenuous physical activity [syn: limber up,
           loosen up]