1. The workers used a machine to tamp down the soil for the foundation.
工人们使用机器来压实地基的土壤。

2. The post office will tamp the packages with a stamp to indicate they have been processed.
邮局会在包装上贴邮戳，以示已处理过。

3. The suspect was accused of tampering with the evidence before the trial.
嫌疑人被指控在审判前篡改证据。

4. It's important to learn how to tamp down anger and find healthy ways to cope.
学会控制愤怒并寻找健康的应对方式是很重要的。