perihal

In a sentence

• Saya berbicara perihal rencana perjalanan kita.

  I talked about the plan for our trip.

  In this sentence, 'perihal' is used to indicate the topic of discussion.

• Kita perlu menyelidiki perihal kehilangan itu.

  We need to investigate the matter of that disappearance.

  Here, 'perihal' refers to the subject or matter being investigated.

• Buku ini menjelaskan perihal budaya lokal.

  This book explains the issue of local culture.

  In this usage, 'perihal' introduces the main topic explored in the book.