虽然action既能作可数名词也可作不可数名词，但在take
action词组中action
为不可数名词，所以该词组通常不说take
actions。例如：
《麦克米伦高阶英汉双解词典》
action 【U】the process of doing something, especially in order to stop a bad situation from developing or continuing (尤指制止坏的局面发展或继续的)行动过程
take action (=begin to do something to solve a particular problem)
《麦克米伦高阶英汉双解词典》
action 【U】the process of doing something, especially in order to stop a bad situation from developing or continuing (尤指制止坏的局面发展或继续的)行动过程
take action (=begin to do something to solve a particular problem)