PHB, page 231

偵察魔法 Detect Magic

1-level Divination (ritual)

在持續時間內，你感覺到法術的存在，在30尺之內。如果你以這種方式感知法術，你可以用你的行動看到任何可見的生物或物體周圍有微弱的光環，在有法術的區域，你學習它的法術類型（如果有的話）。For the duration, you sense the presence of magic within 30 feet of you. If you sense magic in this way, you can use your action to see a faint aura around any visible creature or object in the area that bears magic, and you learn its school of magic, if any.

  此法術可以穿透大多數障礙，但被1尺的石頭，1寸的普通金屬，一塊薄薄的鉛片，或3尺的木頭或泥土阻擋。The spell can penetrate most barriers, but is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.