[誤] The boy absorbs in new knowledge quickly.
[正] The boy absorbs new knowledge quickly.
[正] The boy absorbs into new knowledge quickly.
[正] The boy takes in new knowledge quickly.
注:absorb(吸收)是及物動詞,可以直接跟賓語,absorb in 的意思是“吸引,專心于”,absorb into 才是“吸收”,另外 take in 也表示“吸收”。