by luck

基本解释

The winners were those who -- by luck or design -- had borrowed heavily from banks to buy hard assets, or industrial conglomerates that had issued debentures.
赢家是那些凭运气或故意从银行大笔借款、购买硬资产的人，或者发行债券的企业财团。
In the end, success in this game was largely determined by luck and insight, though each team had developed a system for predicting what the black box would produce from a given input.
最后，虽然每个组都搞了一套预测黑盒结果的系统，但这场游戏中的胜利很大程度上由运气和洞察力决定。
This weekend, as racing resumes in Italy, Massa will appreciate that his recent fate has been shaped by luck that is more good than bad.
周末，F1比赛将在意大利重启，马萨将会明白他最近的命运已经被好多于坏的运气所关照。

He has been followed, day by day, year by year, by a strange luck.
by luck or by inside information or by something, while there's sort of a big academic debate.
单纯的用运气或者内幕消息或者其他东西来解释，尽管对此学术界也存在着极大的争论。
耶鲁公开课 - 金融市场课程节选
The romance heroine is often threatened with rape, but by her cleverness or by good luck or a concatenation of forces ; she can always invariably avert that tragedy; and by the end of the work she can present herself to her future husband as a virgin.
这位传奇的女英雄总是被强奸所威胁，但是多亏了她的机敏，或是走好运，或是一连串的军队暴力,她总是能避免悲剧;,在作品的最终,她呈现在未来丈夫面前的仍是一个处女。
耶鲁公开课 - 弥尔顿课程节选

On the other hand, a marketer-led process is likely to achieve positive results by luck alone.
FORBES: Marketers Have A Better Process Buying Chairs For The Cafeteria, Than For Hiring An Ad Agency