All-purpose means you can use it in any situation — one thing that does many jobs. All-purpose flour in cooking, an all-purpose cleaner, an all-purpose tool. It is a practical shop-and-kitchen word, not a grand one. It tells you the thing is not for one special job only.

All-purpose means意思是 you can use it in any situation任何情況都能用——one thing一樣東西 that does many jobs做很多種工作。in cooking烹飪裡的 all-purpose flour通用麵粉、an all-purpose cleaner萬用清潔劑、an all-purpose tool萬用工具。It它是 a practical shop-and-kitchen word一個實用的、商店和廚房裡的詞，not a grand one不是什麼氣派的詞。It它 tells you告訴你 the thing這樣東西 is not for one special job only不是只為某一種特別工作而生。

Though actually all is a promise on the label: an all-purpose knife will not replace every knife, but it will do well enough for most home tasks. In Taiwan, a US recipe that says all-purpose flour usually points you toward 中筋麵粉, the everyday bag, not a perfect copy of every American flour.

Though actually不過其實，all是 on the label標籤上的 a promise一句承諾：an all-purpose knife一把萬用刀 will not replace every knife不會取代每一把刀，but但 for most home tasks對大多數家庭工作來說 it will do well enough它夠好用了。In Taiwan在台灣，that says all-purpose flour寫著 all-purpose flour 的 a US recipe美國食譜，usually points you toward通常是把你指向 中筋麵粉，the everyday bag最日常的那一袋，not a perfect copy of every American flour而不是每種美國麵粉的完美對應。

It has nothing to do with on purpose (meaning you meant to do it).

It它 with on purpose和 on purpose（meaning you meant to do it意思是「故意」）has nothing to do一點關係也沒有。