须 (xū): ต้อง

According to the regulations, employees must submit a leave request one week in advance.

The doctor instructed him that after surgery he must stay in bed and rest for at least three days.

Before entering the laboratory, you must put on a lab coat and safety goggles.

When applying for a visa, the applicant must provide a valid passport and photos.

When flying, passengers must switch their phones to airplane mode.

The contract states that the tenant must pay the rent before the fifth of each month.