demonstrable

1. ADJ A demonstrable fact or quality can be shown to be true or to exist. 可論證的; 可展示的[正式] [usu ADJ n]

Without demonstrable progress, the negotiators will begin to see their influence wane. 沒有可展示的進展，磋商者將會開始看到他們的影響力減弱。

2. demonstrablyADV

...demonstrably false statements. ...可論證是錯誤的命題。