mental reservation meaning in English

对某项声明所持的保留
意中保留

She outwardly approved of the plan with the mental reservation that she would change it to suit herself
她外表上对这计划表示赞成，但内心却想照自已心意改变它以顺应自己。
I do solemnly swear that i will support and defend the constitution of the united states against all enemies , foreign and domestic ; that i will bear true faith and allegiance to the same ; that i take this obligation freely ; without any mental reservation or purpose of evasion ; that i will well and faithfully discharge the duties of the office on which i am about to enter ; so help me god
我庄严宣誓，我将支持和捍卫美国宪法，反对一切外国及本国的敌人；我将坚持正确的信仰效忠；我自愿履行此义务；决不有所保留或有意逃避；我将忠诚于即将进入的陆战队；愿主保佑。