command 较正式用词，强调权威性、全局性和强制性。
order 普通用词，侧重指具体的命令。
direction 正式用词，指口头或书面的指示或命令。内容不一定详尽，语气较缓和，不太强调强制性。也可指指导性的说明。
instruction 书面用词，指不容违反、不容推翻的命令。也多指包含具体说明的指示。
参考例句
1. Stress can come at us from every direction. 压力来自于我们可以从各个方向。
2. On your way to success, you must keep your direction. 在通往成功的路上，你必须保持你的方向。
3. The direction in which education starts a man will determine his future life. 一个人接受启蒙教育的方向将会确定他今后的一生。
英英解释
n.
1. a line leading to a place or point
2. the spatial relation between something and the course along which it points or moves
3. a general course along which something has a tendency to develop
4. something that provides direction or advice as to a decision or course of action
5. the act of managing something
6. a message describing how something is to be done
7. the act of setting and holding a course
8. a formal statement of a command or injunction to do something
9. the concentration of attention or energy on something
网络释义
direction 方向;
方向，方位;
导演;
方位;
direction indicator 方向指示器;
方向标,转向标;
中心指示器;
方向指示器航向指示器;
