성적 접촉을 통해 사람 사이에 전파되는 박테리아, 바이러스 또는 기생충에 의한 감염성 질환.
An infection or disease commonly passed from one person to another through sexual contact, caused by bacteria, viruses, or parasites.
예문:
"Regular medical checkups are essential for detecting an STD early."
"Education about safe sex can significantly lower the transmission rates of STDs."
교환원의 도움 없이 사용자가 직접 다이얼을 돌려 연결하는 장거리 전화 통신 체계.
A telephone system that allows users to make long-distance calls directly without the assistance of an operator.
예문:
"Before the advent of STD, all long-distance calls had to be placed through a central operator."
"The rollout of STD across the country made communication between cities much faster."