vt.排除，禁止，防止，阻止某人做某事（或加入机构、去某处等）
The railroad gates debar people from crossing the tracks.
铁道的栅栏阻止行人跨越轨道.
Estimate , debar and repair the failure of network and computers.
网络系统、计算机硬件的故障判断、排除和送修.
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