[] (-ll-, , -l-) () to test the quality or performance of a product to see if it will be effective or successful 测试（产品的质量或性能）；试验；试用◆They trialled the product with 20 of their best customers. 他们让 20 位最佳顾客试用了产品。◆Only one in ten drugs which are trialled on humans makes it to the market. 进行过人体试验的药物中只有十分之一得以上市。▸ˈtrialling