obedient: implies compliance with the demands or requests of one in authority: cadets must be ~ to their commanding officer.   cadet军校学员候补军官，形近词carat克拉

docile: implies a predisposition to submit readily to control or guidance: a ~ child who never caused trouble.   (submit指放弃抵抗to surrender after resistance or conflict to the will or control of another, 如voluntarily submitted to an inspection of the premises自愿同意接受对房屋的检查)   （premises房屋及土地the premises of a business or institution are all the buildings and land that it occupies in one place，如there is a kitchen on the premises该处有个厨房)


tractable: suggests having a character that permits easy handling or managing: Indian elephants are more ~ than their African cousins.


amenable: suggests a willingness to yield to or cooperate with advice, demands, or contrary suggestions: he's usually ~ to suggestions and new ideas.   （yield表示屈服时和submit意思一样没有区别，还表示弹性物质向回收缩，如a mattress that yields to pressure垫子在压力下回缩)


obedient服从的: 指服从有权者的要求请求，docile听话的: 指服从于别人的指导和控制(guidance&control)，tractable好管的: 表示易于管理操控，amenable愿接受的: 表示愿意接受或配合别人的建议要求不同观点。


记忆方法: 1）首字母ODTA排序成TOAD谄媚者赖蛤蟆<==表现得顺从

         2）服从的意思是顺从他人的意志或控制mean submissive to the will or control of another.