What you want to ask is what does the horizontal line with a marker pen on the outside of the infusion bottle mean? Mark the time, dosage, doctor's name or signature.

1. Time: Mark the start time and end time of the infusion so that medical staff can monitor the infusion process and adjust the infusion speed.

2. Dosage: Mark the dose of infusion liquid to ensure that the patient receives correct treatment.

3. Doctor’s name or signature: Mark the doctor’s name or signature so that the doctor’s treatment records can be traced and confirmed when needed.