xìn / zhōng / qián / bèi / duì / zhè / wèi / rén / dì / de / xué / yè / jìn / bù / dà / jiā / zàn / shǎng

信中，前辈对这位仁弟的学业进步大加赞赏。

In the letter, the senior greatly praised this young friend for his academic progress.