at lightning speed
固定说法，常与 at 连用，强调速度极快。
She finished the whole report at lightning speed.
她以闪电般的速度完成了整份报告。
极快的；闪电般的
极快或突然；如闪电般快速移动；闪电的
extremely fast or sudden, as if at the speed of lightning
极快或突然；如闪电般快速移动
Extremely fast or sudden; moving (as if) at the speed of lightning.
The rescue team made a lightning decision to save the trapped hiker.
救援队做出了闪电般的决定来营救被困的徒步者。
用法提示：lightning 作形容词，表示“极快的”，修饰 decision，强调决定非常迅速。
She sent a lightning reply to the customer's urgent email.
她闪电般地回复了客户的紧急邮件。
用法提示：lightning 作形容词，描述 reply 非常快速，带出“极快或突然”的含义。
The sprinter's lightning start gave her an early lead in the race.
那位短跑运动员闪电般的起跑让她在比赛中早早领先。
用法提示：lightning 作形容词，修饰 start，说明起跑动作极快，体现“如闪电般快速”的语义。
固定说法，常与 at 连用，强调速度极快。
She finished the whole report at lightning speed.
她以闪电般的速度完成了整份报告。
多作表语或定语，形容速度或反应极快。
The new laptop is lightning fast.
这台新笔记本电脑快如闪电。
作定语置于名词前，表示极其迅速或突然。
The army launched a lightning attack at dawn.
军队在黎明时发动了一次闪电般的袭击。
grammar · medium
易错句子She finished the report at lightening speed.
正确表达She finished the report at lightning speed.
表示“极快、闪电般地”要用 lightning；lightening 是动词 lighten（变亮、减轻）的 -ing 形式，与闪电无关。两个词只差一个字母，拼写时极易混用，要根据想表达的意义选择。
grammar · medium
易错句子The old train was lightning, but it still arrived on time.
正确表达The old train was lightning fast, but it still arrived on time.
形容词 lightning 只作定语，必须放在名词前（a lightning attack、lightning speed），不能单独作表语。汉语“火车快得像闪电”若直译成 The train was lightning 就不合英语习惯；作表语描述速度快，要用 lightning fast，或用 like lightning、at lightning speed 这类状语表达。
闪电般的速度；极快的速度
She finished the report at lightning speed.
她以闪电般的速度完成了报告。
快如闪电的；极快的
The internet connection here is lightning fast.
这里的网速快如闪电。
快如闪电的；十分迅速的
His reaction was lightning quick.
他的反应快如闪电。
闪电般的节奏；极快的速度
Technology is changing at a lightning pace.
科技正以闪电般的节奏变化。
闪电式进攻；突袭
The army launched a lightning attack at dawn.
军队在黎明时发动了闪电式进攻。
闪电般的回应；极迅速的反应
The company gave a lightning response to the complaint.
公司对投诉作出了极迅速的回应。
发长 /aɪ/ 音 (如 high, light)
Same pattern, same sound
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