Daily Chinese Idiom Guessing Game
Something is very obvious and easy to see; it's clear without any explanation.
形容事情或道理很明显，极容易看清楚。
清·李渔《闲情偶寄·结构第一》此显而易见之事，从无一人辩之。”
The solution was so simple that it was obvious to everyone in the room.