fortuitous

adj.

偶然发生的，偶然的；偶发；

1. The occurrence of such things is by no means fortuitous.
   出现这种问题绝不是偶然的。
2. We knew each other by a fortuitous meeting.
   我们在一次偶然的邂逅中认识。
3. A series of fortuitous circumstances advanced her career.
   一系列的幸运事使她的事业一帆风顺。

Cytokines and depression: fortuitous or causative association?
The fortuitous oxidation and cometabolism of various carbon compounds by whole‐cell suspensions of Methylococcus capsulatus (Bath)
Hepatitis C virus and autoimmunity: fortuitous association or reality?
Villous adenoma of main pancreatic duct and pancreatic carcinoma Filiation of fortuitous association?
The psychology of chance encounters and life paths.
Phenotypic Evolution, Constant Covariances, and the Maintenance of Additive Variance
Mating preferences of F 2 segregants of crosses between MHC-congenic mouse strains
Candidate Gustatory Interneurons Modulating Feeding Behavior in the Drosophila Brain
EFFICIENT CAPITAL MARKETS: A REVIEW OF THEORY AND EMPIRICAL WORK*
Abundances of the elements: Meteoritic and solar