second set phenomenon二次: secondary; quadratic现象: appearance; phenomenon二次现象,二次移植现象: second set phenomenon第一次现象,初次现象,首次现象: first set phenomenon初次现象: first-set phenomenon下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:二次现象，即可在微信中查询翻译
