internallyadv.内部地；国内地internaladj.国内的；内部的；身内的internal reward内在奖赏internal blower内置增压器internal shield内屏蔽,内部屏蔽internal strain内应变internal doping内掺internal speech内部言语internal rudder燃气舵internal spline内花键internal remedy内服药internal nature内在自然

1. In the past years intracavernosal and intraurethral agents have been developed, but their clinical use was limited due to its invasiveness, and with high discontinuation rates.
   二线治疗包括阴茎海绵体血管注射疗法和尿道内用药，但因使用时有侵袭性而受限。