急速

1. Origins, structure, and basic meaning

• Structure: 急速 is read as きゅうそく and can mean “rapid” or “swift”, depending on context.
• Basic usage: The examples show rapid infrastructure improvement and a swift evening temperature drop.

2. Common pitfalls and similar expressions

• Distinguishing senses and uses
  • It marks change occurring quickly over a short time and most often appears adverbially as 急速に.