order、bid与command这些动词均含有“命令”之意。

order : 普通用词，多指上级对下级，主人对仆人以及教师对学生等发出的命令，也指态度专横地命令他人。

• The company was ordered to pay compensation to its former employees.
  公司被勒令向以前的员工作出补偿。
• The officer ordered them to fire.
  军官命令他们开火。
• They were ordered out of the class for fighting.
  他们因斗殴被勒令退出课堂。

bid与order同义，但较正式，文学意味强，多指口头直接下的命令。

• I bid £2 000 for the painting.
  我出2 000英镑买这幅画。
• We wanted to buy the chairs but another couple were bidding against us.
  我们想买下那几把椅子，但另一对夫妇在同我们较劲出价。

command : 话意强，指正式下令，强调下令者的权威性，要求必须服从。

• Begin when I give the command.
  我发出命令时开始。
• You must obey the captain's commands.
  你必须服从船长的命令。