演示如何实现认证: demonstrate how to implement authentication
实地: 1.(在现场) on the spot2.(实实在在) indeed; in real earnest◇实地查勘 field reconnaissance; 实地盘存 physical inventory; 实地调查 fact finding; 实地工作 fieldwork; 实地考察 on-the-spot investigation [inspection]; 实地考察
实地观察: field observationfirst hand observationsite observation
