词汇	free fall jump
释义	free fall jump 自由跳伞
随便看	letter numbering system letter of abandonment letter of abatement letter of acceptance letter of acceptance/certificate of enrollment letter of accusation letter of acknowledgement Letter of Activation letter of administration letter of admission letter of advice letter of affirmation of ship auction Letter of Agreement letter of allocation letter of allotment letter of apology letter of appeal letterof application letter of application Letter of application to school letterof appointment letter of appointment Letter of Appointment of Principal letter of appreciation letter of assignment