by day的音標是[ba? da?]，基本翻譯是“日復一日地，在白天”。速記技巧是將其拆分為單詞元素并使用聯想記憶法，可以記為“白天不要拜，拜（拜）了一天，晚上才有時間”。

by day這個詞的詞源可以追溯到古英語by-，意思是“在旁邊”或“在…旁邊”，加上day，表示“在白天”或“在一天中”。

by day的變化形式有復數形式by days，還有過去式和過去分詞by day。

相關單詞有：daylight、everyday、non-stop day、daily、sunlight、midday、noonday、middaytime、daybreak。

例如，daylight指的是“日光”或“白天”，強調白天的光線；everyday指的是“日常的”或“平常的”，強調每天都會發生的事情。

這些單詞都與by day這個短語有直接或間接的聯系，體現了英語單詞的多樣性和靈活性。

常用短語：

1. by daylight 日光明亮處

2. by daybreak 在黎明時分

3. by daylight alone 僅憑日光

4. by daylight one"s eyes 目光銳利

5. by day and night 日日夜夜

6. by daybreak and sunset 黎明和日落

7. by day and by night 白天和黑夜

例句：

1. I often watch birds by daylight, observing their behavior and movements.

2. She is a skilled hunter who can track prey by day and night.

3. The sunrise was beautiful, and I took a photo by daybreak.

4. His eyes were sharp by daylight alone.

5. They worked by day and night to complete the project on time.

6. The couple traveled by day and enjoyed the scenery at night.

7. The storm lasted for days, with heavy rain and winds by day and clear skies at night.

英文小作文：

標題：Day and Night Life

Day and night life is a unique experience that we all enjoy, whether we are at home or on vacation. During the daytime, we can enjoy the sunshine and the fresh air, while at night we can gaze at the stars and enjoy the peace and quiet of the nighttime world.

However, day and night life also brings different challenges and responsibilities. During the daytime, we have to deal with work and school commitments, while at night we need to rest and recover our energy for the next day. We also need to take care of our health, which requires us to follow a healthy diet and exercise routine that is suitable for our body type and lifestyle.

In conclusion, day and night life is an essential part of our lives that we should cherish and appreciate. We should also learn to balance our work, rest, and leisure time to ensure that we are able to maintain our physical and mental health and well-being.