“来而不可失者，时也；蹈而不可失者，机也。”【英】

"Opportunity may knock just once; grab it before it slips away."

译文来源

http://www.fmprc.gov.cn/mfa_eng/wjdt_665385/zyjh_665391/t1178867.shtml

例句

1. 近1000年前，中国宋代文学家苏轼说过：“来而不可失者，时也；蹈而不可失者，机也。”发展中美关系要顺时应势、与时俱进。——《努力构建中美新型大国关系——习近平在第六轮中美战略与经济对话和第五轮中美人文交流高层磋商联合开幕式上的致辞》

1. About 1,000 years ago, Su Shi, a famous writer of China's Song Dynasty, said, "Opportunity may knock just once; grab it before it slips away."—Quoted from Work Hard to Build a New Model of Major-Country Relationship Between China and the United States—Address at the Joint Opening Ceremony of the Sixth Round of the China-US Strategic and Economic Dialogue and the Fifth Round of the China-US High-level Consultation on People-to-People Exchange