1
on the front line
Doctors are working on the front line against the pandemic.
医生们正在抗击疫情的第一线工作。
前线
先理解核心含义，再看它在真实句子里的用法。
前线
the area where soldiers are fighting the enemy
Doctors are working on the front line against the pandemic.
医生们正在抗击疫情的第一线工作。
军事用语
前线；敌对双方之间的边界。
A front, or a boundary between opposing positions.
冲突、行动或有争议事件的地点。
A site of a conflict, effort, or controversial matter of any kind.
与外部人员(如客户)互动的第一线。
The site of interaction with outsiders, such as customers.
攻击线；全体进攻队员或前锋。
attack, collectively the attackers or forwards.
Doctors and nurses are on the front line of the fight against the epidemic.
医生和护士处于抗击疫情的第一线。
Our customer support team works on the front line, dealing with complaints every day.
我们的客户支持团队工作在第一线，每天处理投诉。
The soldiers were sent to the front line to defend the border.
士兵们被派往前线保卫边境。
Doctors are working on the front line against the pandemic.
医生们正在抗击疫情的第一线工作。
They are on the front line of climate change research.
他们处于气候变化研究的前沿。
作定语时常用连字符。
Front-line workers deserve our respect.
一线工作人员值得我们尊重。
Not this
He works on the frontline.
Use this
He works on the front line.
当 'front line' 作为名词短语表示“前线”时，应写为两个单词。形容词用法 'frontline' 不同。
Not this
She serves in the front line.
Use this
She serves on the front line.
英语中表示“在前线”固定搭配介词用 'on'，而不是 'in'。中文“在第一线”的“在”容易导致误用。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use front line naturally, then get feedback on meaning, tone, grammar, and phrasing.
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常用作单数
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.