more than fifty years ago去: go; leave今: modern; present-day; nowaday ...五十余年: fifty odd yearsⅣ spare time五十余年: fifty odd years三十余年的实际应用证明: kevlar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:去今五十余年，即可在微信中查询翻译
