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. The doctor ordered you to stay in bed. 医生叮嘱你要卧床休息。
2. Work they ever in harmony and order. 他们永远工作在和谐和秩序
3. What is your order quantity every month? 你们每个月的订货量是多少？
英英解释
n.
1. (often plural) a command given by a superior (e.g., a military or law enforcement officer) that must
2. a degree in a continuum of size or quantity
3. established customary state (especially of society)
4. logical or comprehensible arrangement of separate elements
5. a condition of regular or proper arrangement
6. a legally binding command or decision entered on the court record (as if issued by a court or judge)
7. a commercial document used to request someone to supply something in return for payment and providin
8. a formal association of people with similar interests
9. a body of rules followed by an assembly
10. (usually plural) the status or rank or office of a Christian clergyman in an ecclesiastical hierarch
11. a group of person living under a religious rule
12. (biology) taxonomic group containing one or more families
13. a request for food or refreshment (as served in a restaurant or bar etc.)
14. (architecture) one of original three styles of Greek architecture distinguished by the type of colum
15. the act of putting things in a sequential arrangement v.
1. give instructions to or direct somebody to do something with authority
2. make a request for something
3. issue commands or orders for
4. bring into conformity with rules or principles or usage; impose regulations
5. bring order to or into
6. place in a certain order
7. appoint to a clerical posts
8. arrange thoughts, ideas, temporal events
9. assign a rank or rating to
