cold-calling
noun [ U ] uk/ˈkəʊldˌkɔː.lɪŋ/ us/ˈkoʊldˌkɑː.lɪŋ/
（未经要求而打给潜在客户的）冷不防电话，促销电话
the activity of calling or visiting a possible customer to try to sell them something without being asked by the customer to do so
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