keep a diary
表示长期、习惯性地记日记；要说明记录的内容，可用 keep a diary of sth。
She has kept a diary since she was ten years old.
她从十岁起就一直写日记。
日记本；记录日常经历的日志,尤其是作者的经历；记录日常(通常是个人)经历和观察的书面记录；个人日记(作为实物)；日记；[经] 日记簿
a daily record of personal experiences and observations
记录日常经历的日志,尤其是作者的经历
A daily log of experiences, especially those of the writer.
记录日常(通常是个人)经历和观察的书面记录
a daily written record of (usually personal) experiences and observations
个人日记(作为实物)
a personal journal (as a physical object)
I write in my diary every night before going to sleep.
我每晚睡觉前都会写日记。
用法提示：日记指记录个人日常经历的日记本或日志。
She kept a diary during her trip to Japan.
她在日本旅行期间坚持写日记。
用法提示：此处 diary 指旅行期间的每日记录。
His old diaries are stored in a box in the attic.
他的旧日记本存放在阁楼的一个箱子里。
用法提示：diaries 是 diary 的复数，指多本日记本。
表示长期、习惯性地记日记；要说明记录的内容，可用 keep a diary of sth。
She has kept a diary since she was ten years old.
她从十岁起就一直写日记。
强调把某事写进日记本这个实物里的一次具体动作，diary 指本子本身。
He wrote the meeting time in his diary.
他把会议时间写在了日记本里。
用 of 引出日记所记录的内容或所记之人的身份。
This is the diary of a wartime nurse.
这是一位战时护士的日记。
grammar · medium
易错句子I write in my dairy every night.
正确表达I write in my diary every night.
dairy 是可数名词，意思是“乳制品、奶制品”，与“日记”无关；表示“日记”必须用 diary。两词只差 -ia- 与 -ai- 的字母顺序，但意义完全不同，不要凭拼写相近混用。
grammar · medium
易错句子I keep diary every day.
正确表达I keep a diary every day.
diary 是可数名词，单数形式前必须加冠词或其他限定词。汉语说“记日记”不加冠词，但英语里可数名词单数不能裸用，所以要说 a diary（或 my diary）。
grammar · medium
易错句子She wrote on her diary last night.
正确表达She wrote in her diary last night.
表示“把内容记录在日记里”时，英语用介词 in，因为内容写在日记本的页面之内；on 指写在物体表面（如封面上），不能用来表示写日记内容。
记日记；坚持写日记
She has kept a diary since she was a teenager.
她从十几岁起就一直记日记。
日记条目；一则日记
He wrote a short diary entry about the trip.
他写了一则关于这次旅行的简短日记。
在日记里写东西
I write in my diary every night before bed.
我每晚睡前都会在日记里写点东西。
私人日记
She hid her personal diary under the mattress.
她把私人日记藏在了床垫下。
旅行日记
He published a travel diary about his year in Asia.
他出版了一本关于他在亚洲那一年经历的旅行日记。
饮食日记
Keeping a food diary can help you lose weight.
记饮食日记有助于减肥。
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