Definition
to discharge a firearm or cause an explosion, such as with a bomb or fireworks.
發射（槍炮）；引爆（炸彈或煙花）
During the New Year, many cities let off fireworks to celebrate, causing them to boom in the sky.
在新年期間，許多城市會燃放煙花來慶祝，讓它們在天空中綻放。
In the training course, they learned how to let off firearms safely without harming others.
在訓練課程中，他們學習了如何安全地發射槍支而不傷害他人。
The police successfully let off the bomb during the operation, ensuring the safety of the area.
警察在行動中成功引爆了炸彈，確保了該地區的安全。