读音

/ˈɑːpʃənl/

释义

• 形容词: 可选择的，非强制的，不是必需的。例如: “The extra features on the car are optional.”
• 名词: 可选项，非必需品。例如: “You can choose from several optional courses in this semester.”

短语

• “Optional extras” 指可选的额外服务或产品。
• “An optional activity” 是一项可以选择参加或不参加的活动。

例句

• 形容词: “Attendance at the workshop is optional, so you can decide whether to go or not.”
• 名词: “The travel insurance is an optional purchase when booking your trip.”

同义词

• Discretionary
• Voluntary
• Non-compulsory
• Unnecessary
• elective