fast asleep的音標為：[fɑ?st ??s??k]，基本翻譯為“熟睡”，速記技巧為：fast（沉睡）+ asleep（睡著）→熟睡。

Fast asleep的英文詞源為：

fast：來自中古英語fast，意為快速的，敏捷的。

asleep：來自古英語aspeo，意為睡眠狀態。

fast asleep作為形容詞，意為“熟睡中”。其變化形式為副詞形式fast asleep，介詞形式in/on the fast asleep。相關單詞有：asleep，snore，sleepy，sleepwalk，nap，slumber，somnolent，torpor。其中，asleep意為“睡著的”，snore意為“打鼾”，sleepwalk意為“夢游”。fast asleep在句子中可以作表語或狀語，例如“The children were fast asleep in bed”和“She fell fast asleep on the train”。這些單詞都與睡眠狀態有關，描述了不同程度和狀態的睡眠。

常用短語：

1. be fast asleep

2. asleep in one"s boots

3. sleep like a log

4. drop off to sleep

5. nod off

6. snore loudly

7. sleep soundly

例句：

1. The children were fast asleep in their beds.

2. He slept like a rock and didn"t even nod off during the movie.

3. She woke up her roommate by snoring so loudly!

4. After a long day of work, I dropped off to sleep quickly.

5. I always find it hard to sleep soundly on weekends.

英文小作文：

Sleep is an essential part of our daily routine, and it is crucial for our physical and mental health. I remember the first time I slept soundly through the night, it was such a wonderful feeling. I woke up refreshed and ready to take on the day. However, sleep is not always easy to come by, especially if you have insomnia or restless sleep patterns. Sometimes, we need to make sure we create the right environment and adopt certain habits to ensure we get a good night"s sleep. I hope everyone can experience the joy of sound sleep and wake up refreshed every morning.