察知

1. Origins, structure, and basic meaning

• Structure: 察知 (さっち) is a noun that also forms a する verb for detecting a subtle change or sign.
• Basic usage: It applies to a sensor detecting a change or a person noticing another's hesitation.
  • センサーがわずかな温度変化を察知した。 — The sensor detected a slight temperature change.
  • 彼女は相手の迷いをすぐに察知した。 — She immediately noticed the other person's hesitation.

2. Common pitfalls and similar expressions

• Detection and general knowledge
  • 察知 suggests quickly detecting a subtle change or hidden sign, while 知る more broadly means coming to know a fact.