obvious at a glance
彼が彼女を好きなのは行動から見て一目瞭然だ。
It's obvious from his actions that he likes her.
トムがメアリーにキスをしたくないというのは一目瞭然だった。
It was obvious that Tom didn't want to kiss Mary.
マストのペノンを見れば、それは一目瞭然だった。
It was immediately obvious from the pennant on the mast.
トムが嘘をついていたのは一目瞭然だった。
It was obvious at a glance that Tom was lying.