為甚麼我們要當機立斷？(10分)急用

當，即係「適逢」、咁o岩得咁轎；或可解作「面對」。
機，機會、機緣、唔係時時有o個d先稱得上係機緣架，成日有就唔係架喇。
立，立即、立刻、即時。
斷，決斷、決定、下判斷。

「當機」應該「立斷」，因為機會唔係時時有，如果難得遇上機會，但沒有好好把握，就會錯失營造美好將來的可能性，故此，面對機會，人理當要盡快作出正確的判斷。

"要" "當機立斷" is to clear up the outstanding work. Whether the decision is correct or not is another issue. The result of "當機立斷" is that we can take up another work rather that working on the same issue. "當機立斷" does not have the implication of making a correct decison, but emphasize on "立斷". i.e. Immediately file close.