sample hold

例句：

1. 1.The sample holds the key to solving the problem.
   这个样本是解决这个问题的关键。
2. 2. The company held a press conference to discuss the new product.
   公司举行了新闻发布会来讨论新产品。
3. 3. The scientist held the test for several hours before making any conclusions.
   科学家进行了几次测试，然后才得出结论。