Central authority has been progressively weakened since the outbreak of the civil war.内战爆发后，中央权力被逐渐削弱了。His failures chipped away at his self-confidence.屡次失败逐渐削弱了他的自信。The survey reveals a gradual erosion of the president's popularity and support.民意调查显示了总统声望和所获支持的逐渐削弱。