market research         
noun [ U ] uk/ˌmɑː.kɪt rɪˈsɜːtʃ/ us/ˌmɑːr.kɪt ˈriː.sɝːtʃ/
 市场调研,市场调查
the collection and examination of information about things that people buy or might buy and their feelings about things that they have bought
  Market research shows that demand for small cars will continue to grow. 市场调研显示对小型车的需求会继续增长。 
 market researcher
noun [ C ] ukus
 市场调查员
someone whose job is doing market research