1
flatten sth
及物用法，表示使某物变平。
He flattened the dough with a rolling pin.
他用擀面杖把面团压平。
弄平；使变平
flattens — third person singular of flatten
先理解核心含义，再看它在真实句子里的用法。
弄平；使变平
To make something flat or flatter.
He flattened the dough with a rolling pin.
他用擀面杖把面团压平。
使某物变平或变得更平。
To make something flat or flatter.
将身体紧贴墙或地板等表面,尤指为避免被发现或伤害。
To press one's body tightly against a surface, such as a wall or floor, especially in order to avoid being seen or harmed.
击倒；打倒；使倒下。
To knock down or lay low.
变平；趋于平稳。
To become flat or flatter; to plateau.
flatten
Base
原形
flattens
3rd person
第三人称单数
flattening
-ing
现在分词
flattened
Past
过去式
flattened
Past participle
过去分词
She flattens the dough.
她把面团压平。
He flattened the box yesterday.
他昨天把盒子压平了。
They have flattened the area.
他们已经把那片区域整平了。
规则动词，表示'使变平'。
He flattened the cardboard box before putting it in the recycling bin.
他把纸箱压平，然后放进回收箱。
She is flattening the dough with a rolling pin to make cookies.
她正用擀面杖把面团擀平来做饼干。
The hammer flattens the nail head so it sits flush with the wood.
锤子把钉子头敲平，使其与木头齐平。
及物用法，表示使某物变平。
He flattened the dough with a rolling pin.
他用擀面杖把面团压平。
不及物用法，表示某物自身变平。
The hill flattens out near the top.
山丘在接近顶部时变得平坦。
音乐术语，指将音符降低半音。
You need to flatten the B in this measure.
你需要在这个小节中将B音降半音。
Not this
I need to flat the paper.
Use this
I need to flatten the paper.
英语中，'flat'是形容词，意为'平的'；表示'使变平'的动作需用动词'flatten'。这里应使用动词原形，后面直接跟宾语。
Not this
He told me to flatten.
Use this
He told me to flatten the box.
'flatten'作为及物动词，通常需要宾语来指明被弄平的对象。原句缺少宾语，导致语义不完整。应补充宾语如'the box'。
Not this
She flatted the dough.
Use this
She flattened the dough.
'flatten'的过去式是'flattened'，不是'flatted'。学习者混淆了规则动词的过去式构成，应注意双写n再加-ed。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
使曲线平缓
Social distancing helps flatten the curve of infections.
社交距离有助于使感染曲线平缓。
把纸弄平
She flattened the paper with her hand.
她用手把纸弄平。
把面团擀平
Use a rolling pin to flatten the dough.
用擀面杖把面团擀平。
变平；趋于稳定
The landscape flattens out after the hills.
过了山丘，地形变得平坦。
夷平建筑物
The earthquake flattened entire buildings.
地震夷平了整栋建筑。
彻底击败对手
Our team flattened the competition in the finals.
我们队在决赛中彻底击败了对手。
拉平曲线（尤指疫情传播曲线）
Social distancing helped flatten the curve of infections.
社交距离有助于拉平感染曲线。
变平；趋于平稳
The learning curve flattens out after the initial training.
初始培训后学习曲线趋于平稳。
彻底击败或打倒某人
The team flattened their opponents in the final match.
该队在决赛中彻底击败了对手。
我们需要拉平曲线。
Flattening the curve has been a key public health strategy during the pandemic.
疫情期间，拉平曲线一直是一个关键的公共卫生策略。
Use flattens naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
flat（平的）+ ten（十）= 把十个不平的东西压平，牢记 flatten 就是弄平。
常见场景：物理压制、比喻打击 flatten 作为动词，既可用于物理上使物体变平（如压平纸张或地面），也可用于比喻意义（如击败对手或使经济放缓）。在正式和非正式语境中都常见，但具体使用需根据上下文判断。
Only 'fatten' rhymes with 'flatten' (both /ˈfætən/). The others share the '-tten' spelling but have different vowel sounds (/ɪ/ vs /æ/ or include /r/).
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.