forelock（n.）
"额头上生长的一缕头发"，古英语 forelocca "前发"，参见 fore- 和 lock（n.2）。
"Opportunity has hair in front, behind she is bald; if you seize her by the forelock, you may hold her; but, if she once escapes, not Jupiter himself can catch her again." ["Dictionary of Latin Quotations, Proverbs, Maxims and Mottos," H.T. Riley, London, 1866]
"机不可失，时不再来"。["拉丁语引语、谚语、格言和座右铭词典"，H.T. Riley，伦敦，1866]