忽然晕倒用英语怎么说

"忽然晕倒"用英语可以翻译为 "suddenly faint" 或 "suddenly pass out".

"Faint" 是一个动词，意思是 "昏厥、晕倒"。

"Pass out" 也是一个动词，意思是 "昏倒、晕倒"。

下面是一些使用 "suddenly faint" 和 "suddenly pass out" 的英文例句及其中文翻译：

She suddenly fainted and fell to the ground. (她突然昏厥，倒在地上。)
I suddenly passed out and woke up in the hospital. (我突然昏倒，醒来时在医院里。)
He was fine one minute and then suddenly fainted. (他一分钟前还好，但突然昏厥了。)
She felt dizzy and then suddenly passed out. (她感到眩晕，然后突然昏倒了。)

如果你想要表达某人因为其他原因而忽然晕倒，你可以使用以下表达方式：

She suddenly fainted due to low blood pressure. (她因血压过低而突然昏厥。)
He suddenly passed out because of the heat. (他因为高温而突然昏倒。)
She collapsed and fainted suddenly because of dehydration. (她因脱水而突然倒下昏倒。)
He fainted suddenly due to an allergic reaction. (他因过敏反应而突然昏倒。)

希望这些信息对你有帮助。