⏰ 時間介系詞

⏰ at — 用於「點」時間

at 7 o'clock, at noon, at midnight, at night

📅 on — 用於「天」

on Monday, on May 5th, on Christmas Day, on my birthday

🗓️ in — 用於「長時段」

in the morning, in May, in 2024, in summer, in the 21st century