adj.可论证的；显而易见的
Is there a demonstrable need for the project? 能否证明项目有必要进行？
It has achieved demonstrable results, but not yet enough. 它已取得了显著成效，但还远远不够。
In contrast, most cases in children have no demonstrable cause. 相反，大多小孩的病例没有明显的原因。
