这个词是什么意思？
A direct communication system, usually telephone, established for instant contact. It is designed to provide special information and assistance through trained personnel and is used for counseling, referrals, and emergencies such as poisonings and threatened suicides.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D015277 · MeSH 2026。
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