stumbling

that bunch of stumbling amateurs.

那群老是出错的业余人员。

a major stumbling block to the acceptance of homeopathy.

接受顺势疗法的主要障碍。

got a real shiner from stumbling into the door.

撞到门上弄个乌眼青

The question of disarmament proved a major stumbling block to agreement.

结果证明裁军问题是达协议的主要障碍。