oc+cas+ion

• oc-前缀，表示‘向’或‘对’
• cas来自拉丁语‘cadere’，意为‘落下’或‘发生’
• -ion后缀，表示‘行为’或‘状态’

oc-（向）+ cas（发生）+ -ion（状态）= occasion（场合；时机；理由）

casualcasual

cas（发生）+ -ual（形容词后缀）= 偶然的；非正式的

accidentaccident

ac-（向）+ cid（落下）+ -ent（名词后缀）= 事故；意外

occasionedoccasioned

occasion（场合；时机；理由）+ -ed（过去式后缀）= 引起的；导致的

occasionaloccasional

occasion（场合；时机；理由）+ -al（形容词后缀）= 偶尔的；临时的

1. 释义 1场合；时机；理由

   We met on several occasions.

2. 释义 1场合；时机；理由

   This is not the occasion for a detailed discussion.

3. 释义 1场合；时机；理由

   He took the occasion to leave the room.