例句
1.昔日充满孩子们欢声笑语的教学楼，如今已经变成一片废墟。
2.昔日荒无人烟的大沙漠，已经变成了繁华的石油城。
1. 往日；从前。
引
1. 昔日赵攻甄，子弗能救。
《史记·田敬仲完世家》
2. 昔日曾经自弄他，今朝并悉从人弄。
唐
《游仙窟》
张𬸦
3. 虽我一时兵败来投，昔日也曾为盟主，也该让我一分。
《快心编二集》第一回
4. 昔日的战斗意志到哪里去了？士兵们对战争已经没有了胃口。
《东方》第四部第十二章
魏巍
“昔日”是一个表示“前天”或“过去”的词语。它 often appears in literature or historical texts to refer to events or situations that happened in the past. For example, “昔日的盛况” (citation:1) refers to the prosperity of the past, and “昔日的战争” (citation:2) refers to past wars.
In modern Chinese, “昔日” is less commonly used in daily conversations, but it can still be found in formal writings, novels, and poems to express nostalgia or to describe historical events.
In summary, “昔日” is a word that refers to the past or bygone days, and it is often used in a formal or literary context.