脆弱性;脆弱之物the quality of being vulnerable (= able to be easily hurt, influenced, or attacked), or something that is vulnerable
You want a doctor who understands the patient's vulnerability. 您需要一位了解患者脆弱心情的医生。
Those who organized the attacks exploited vulnerabilities in the nation's defences. 那些组织袭击的人利用了该国防御上的弱点。
See: vulnerable