The lack of system leads the ensuring activities to a state of disorder which brings the confusion for judicial practice but also it makes people throw doubt upon the effectiveness of guarantor security approach .

制度的缺失导致保证活动处于无序状态，给司法实践带来了困惑的同时，也让人们 对人保方式的有效性 产生 怀疑。

Don 't throw doubt upon the matter .

对那件事勿 容 置疑。

The latest scientific discoveries throw doubt upon the original theory .

最近的科学发现促使 人们 对原先的理论 产生了 怀疑。