yóu / yú / zhǔn / bèi / bù / zú / tā / méi / néng / cān / jiā / bǐ / sài / zhì / jīn / réng / rán / bào / hàn

由于准备不足，他没能参加比赛，至今仍然抱憾。

Because he was not well prepared, he could not take part in the competition and still regrets it.