承諾義務，正式承諾執行或不執行特定行為
The contractor gave an undertaking to complete the work by March.
承包商作出承諾將在三月前完工。
想把「undertaking」記進長期記憶？
登入後用科學排程（FSRS）複習，還有連續天數與徽章等你解鎖。