appearance
əˈpɪərəns noun
3
STH NEW STARTS TO EXIST
新事物开始出现
when something new begins to exist or starts being used 出现; 问世; 开始使用 singular 单数
4
ARRIVAL
到达
the unexpected or sudden arrival of someone or something 〔出其不意的〕到来,出现 C usually singular 一般用单数