the reason(s) is (are) as follows
A set phrase used to introduce an explanation or list of reasons, often in formal or written contexts. Literally 'the reason like the left', referring to text written to the left (or below) in traditional vertical writing.
For the reasons as follows, today's meeting has been postponed.
As the reasons are as stated below, we ask for your understanding.
A fixed expression combining 左 (left, referring to text written to the left in traditional vertical writing) and 訳 (reason). The phrase literally means 'the reason like the left' and is used to introduce an explanation that follows.