look on
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問題を傍観するだけでは解決しない。
Simply standing by and watching will not solve the problem.
彼は議論を傍観して何も言わなかった。
He merely observed the debate and said nothing.
傍観者でいるのは楽だが無責任だ。
It is easy to remain a bystander, but it is irresponsible.