Definition
To be formally recorded in writing.
以書面形式記錄；白紙黑字。
The contract states in black and white that you must fulfill your obligations.
合約上白紙黑字寫明你必須履行義務。
I need to see the agreement in black and white before I can believe the promise.
我需要看到書面協議才能相信這個承諾。
The details of the policy have been put down in black and white to ensure there are no misunderstandings.
政策細節已白紙黑字寫下，以確保沒有誤解。