If the two pandas have a cub, the new contract states the Memphis Zoo does not have to pay China a yearly fee on that. However, the cub will have to be returned to China after four years.
Panel study. A panel study is a longitudinal study design where a cross-sectional sample of units is selected and surveyed at usually regular intervals. The observation units may be individuals, households, firms or other organisations, or even countries. Household panel surveys are an important sub-type of panel study.
Definition of panel for English Language Learners. : a group of people who answer questions, give advice or opinions about something, or take part in a discussion for an audience. : a group of people with special knowledge, skill, or experience who give advice or make decisions.