Obligation of contract
[经] 履行合同(契约)义务
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
Do you want manual or automatic transmission?
你的汽车想配备一个手动挡还是自动挡？
Health and cheerfulness mutually beget each other.
健康愉快，相生相成。
Good morning, teacher.
老师早上好！