work hard
collocation努力工作；用功
She works hard every day to support her family.
她每天努力工作来养家。
使劲地；努力地；猛烈地
hardest — superlative of hard
先理解核心含义，再看它在真实句子里的用法。
使劲地；努力地；猛烈地
With much force or effort.
She studied hard for the final exams.
她为期末考试努力学习。
用很大力气或努力
With much force or effort.
困难地
With difficulty.
紧密地
Compactly.
He pushed the door hard to open it.
他用力推门把它打开。
It rained hard all night.
整夜雨下得很大。
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努力工作；用功
She works hard every day to support her family.
她每天努力工作来养家。
尽力；努力尝试
Try harder next time.
下次再努力一些。
认真思考；使劲想
Think hard before you answer the question.
回答问题前请认真思考。
猛烈打击；重创
The earthquake hit the city hard.
地震重创了这座城市。
下大雨
It rained hard all night.
整晚都下着大雨。
难以改掉；顽固存在
Old habits die hard.
旧习惯很难改掉。
忙于工作；努力工作
The staff were hard at work preparing for the opening ceremony.
员工们正忙着为开幕式做准备。
对某事感到非常难过，深受打击
She took the rejection hard and needed some time to recover.
她因遭到拒绝而深受打击，需要一些时间恢复。
(习惯、观念等)难以消除，根深蒂固
Old habits die hard, but with patience you can change.
旧习难改，但只要有耐心，你也能改变。
努力工作，尽情玩乐。
She works hard and plays hard on weekends.
她周末既努力工作，也尽情玩乐。
我工作越努力，运气就越好。
He studied harder for the final exam than I did.
他期末考试比我更用功。
Use hardest naturally, then get feedback on meaning, tone, grammar, and phrasing.
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想象 hit hard 狠狠一击，work hard 拼命干活：hard 作副词就是'用力/努力地'。
语域：neutral 常见场景：工作与学习、体力活动、描述困难处境 作为副词，hard 多用于表示用力、努力或困难地，在口语和书面语中都比较常见。具体意思需根据搭配判断，例如 work hard 表示努力工作，hit hard 表示猛烈击打。
与 hard 押韵：card /kɑːd/、yard /jɑːd/、guard /ɡɑːd/、lard /lɑːd/（都读 /ɑːd/）。ward /wɔːd/ 和 heard /hɜːd/ 拼写相近，但不与 hard 押韵，注意元音不同。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.