code: func newTranslateFileReader(ctx context.Context, store *TranslateFile, offset int64) *translateFileReader {
  	return &translateFileReader{
  		ctx:     ctx,
  		store:   store,
  		offset:  offset,
  		notify:  store.WriteNotify(),
  		closing: make(chan struct{}),
  	}
  }
docs: // newTranslateFileReader returns a new instance of translateFileReader.