This is the 6654th most frequent Korean word.
원인으로
"Due to" or "because of."
'원인으로' is used here to describe the cause of 'preparation deficiency' related to the 'failure'.
그의 실패는 준비 부족을 원인으로 볼 수 있다.
His failure can be seen as caused by a lack of preparation.
'원인으로' denotes here the cause of the accident being the 'slippery roads'.
사고는 미끄러운 도로를 원인으로 발생하였다.
The accident occurred due to slippery roads.
'원인으로' is applied to explain the primary cause of the disease related to 'genetic factors'.