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这是我想自己编的代码，但是调用不起作用

let course = {
                name: "",
                description: "",
                students: [],
                addStudents(studentName) {
                    this.students.push(studentName);
                    console.log(`${studentName} added to ${this.name}course`);
                },
                date: "12/12/2021",
            };
            let english = {
                name: "english course",
                description: "this is good course",
                students: [],
            };
            let math = {
                name: "math course",
                description: "this is very good course",
                students: [],
            };
            let addStudents = math.addStudents;
            addStudents.call(english, "Enoh");
            addStudents.call(math, "Daniel");
            addStudents.call(english, "Ellias");
            addStudents.call(math, "Rafael");
            console.log(math);
            console.log(english);

这是我想自己编的代码，但是调用不起作用