He found the precious set of stamps by incidentally when he cleaned his storing books.
He found the precious set of stamps by incidentally when he cleaned his storing books.
整理他的藏书时，他意外的地发现一套珍贵邮票。
He found the precious set of stamps by incidentally when he cleaned his storing books.
整理他的藏书时，他意外的地发现一套珍贵邮票。