This is the 13997th most frequent Korean word.
매뉴얼로
"Manually" or "by manual."
In this sentence, "매뉴얼로" is used as an adverbial phrase indicating the method (using the manual) by which the action of assembling the machine is performed.
나는 매뉴얼로 기계를 조립했다.
I assembled the machine using the manual.
Here, "매뉴얼로" describes the manner or method of learning, indicating that the manual serves as the medium.
매뉴얼로 배우는 것이 더 효율적이다.
Learning through the manual is more efficient.
In this context, "매뉴얼로" specifies that the manual is to be used for the verification process.