zài / jiào / liàn / de / zhǐ / dǎo / xià / tā / de / qiú / jì / yí / rì / qiān / lǐ / yǐ / jīng / chéng / wéi / duì / lǐ / de / zhǔ / lì

在教练的指导下，他的球技一日千里，已经成为队里的主力。

Under the coach's guidance, his skills improved rapidly, and he has become a key player on the team.