a grave + noun
grave 作定语时多修饰神情、语气、错误、后果等名词，比 serious 更显庄重。
The judge spoke in a grave voice.
法官用严肃的语气说话。
严重的；重大的
gravest — superlative of grave
严肃的；庄重的；低沉的；低音的；具有庄重严肃感的；音调低沉的；严重的；重要的；可怕的
Serious and important, especially in a way that makes you worried
具有庄重严肃感的
Characterised by a dignified sense of seriousness.
音调低沉的
Low in pitch, tone etc.
严重的；重要的；可怕的
Serious, in a negative sense; important, formidable.
The judge had a grave expression as he read the verdict.
法官在宣读判决时表情严肃。
用法提示：句中 grave 用作形容词，表示“严肃的”。
This is a grave mistake that could cost us the game.
这是一个严重的错误，可能会让我们输掉比赛。
用法提示：句中 grave 用作形容词，表示“重大的”。
Her voice took on a graver tone when she mentioned the accident.
当提到那场事故时，她的声音变得更为低沉。
用法提示：句中 graver 是 grave 的比较级，表示“更沉重的”。
grave 作定语时多修饰神情、语气、错误、后果等名词，比 serious 更显庄重。
The judge spoke in a grave voice.
法官用严肃的语气说话。
用于系动词后作表语，常描写人的神情或语气。
She looked grave as she read the letter.
她读信时神情严肃。
比较级 graver 多用于说明事态的严重程度。
The situation is graver than we expected.
情况比我们预想的更严重。
最高级 gravest 前一般要加 the。
This is the gravest threat the region has faced.
这是该地区面临的最严重威胁。
grammar · medium
易错句子There was grave rain yesterday.
正确表达There was heavy rain yesterday.
表示“雨很大”英语固定用 heavy rain，不用 grave；grave 指局势、问题、后果等严峻或严重，不修饰天气。
grammar · medium
易错句子It is grave mistake.
正确表达It is a grave mistake.
mistake 是可数名词单数，前面必须加不定冠词 a/an；汉语没有冠词系统，容易漏掉。grave 以辅音音素 /ɡ/ 开头，所以用 a。
grammar · medium
易错句子His life is grave danger.
正确表达His life is in grave danger.
“处于危险中”英语说 be in danger，介词 in 不能省略；grave 只是修饰 danger 的形容词，不能代替 in danger 这个介词短语。
严重关切；深感忧虑
The report raised grave concerns about public safety.
这份报告引起了公众对安全的严重关切。
严重危险；极大危险
The climbers were in grave danger of losing their way.
这些登山者面临着迷路的严重危险。
严重错误
It would be a grave mistake to ignore their warnings.
忽视他们的警告将是一个严重的错误。
严重后果
Cutting down these trees could have grave consequences for the ecosystem.
砍伐这些树木可能会对生态系统造成严重后果。
严峻形势
The country is facing a grave situation.
这个国家正面临严峻的形势。
严重怀疑；很大的疑虑
I have grave doubts about his plan.
我对他的计划有很大的疑虑。
常与grave搭配描述严重的威胁或风险
grave crisis指严峻的危机，体现其‘严重的’义项
grave concern表示深切担忧，与严肃语气相关
指低沉严肃的语调，呼应grave‘音调低沉的’含义
庄重场合的仪式带有的严肃氛围与grave相关
最有权势、庄重而可敬的元老们，我无比尊贵、公认正直的大人们。
In Shakespeare's Othello, Othello opens his defense before the Venetian Senate with this respectful address; here 'grave' means dignified and serious.
在莎士比亚的《奥赛罗》中，奥赛罗用这句恭敬的开场白在威尼斯元老院为自己辩护；这里的 grave 意为“庄重、严肃”。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.