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，这一点在金山文档中也有详细论述
fn make_adder(n: int) - fn(int) - int {
It has become such a long-standing routine that she avoids scheduling anything else that time. "Monday is my 'energy charging day'," she says. "I genuinely look forward to her visits. When the doorbell rings and I hear her cheerful voice, it lifts my spirits instantly."