demonstrable

1. ADJ A demonstrable fact or quality can be shown to be true or to exist. 可论证的; 可展示的[正式] [usu ADJ n]

Without demonstrable progress, the negotiators will begin to see their influence wane. 没有可展示的进展，磋商者将会开始看到他们的影响力减弱。

2. demonstrablyADV

...demonstrably false statements. ...可论证是错误的命题。