Interpretation of idioms of unannounced visits and clear observation

The original idiom: observing in secret, observing in detail.

Standard pronunciation: à n ch á ming fng

Traditional Writing: Secret Investigation and Public Interview

What does an unannounced visit mean: investigation: look carefully, examine carefully; Interview: looking for an interview. Refers to the investigation and understanding of the situation through various methods.

Unannounced visit to idioms solitaire: Pearl casts a shadow → Unannounced visit → Visiting relatives and friends.

Usage analysis: as predicate and attribute; To celebrate

Pronunciation warning: To promote Putonghua, please press the phonetic symbol à n Chá mí ng FNG to read in standard four tones.

Source description: "History of Jin Dynasty": "This generation secretly visits, and there are political voices."

Corresponding synonym: unannounced visit.

Examples of "sentence-making" in secret investigation and public interview;

After an unannounced visit, we finally found the crux of the problem.