Cách sử dụng
The phrase "testify to" means to provide evidence or proof in support of something. It is often used when giving a statement under oath in a court of law. For example, a witness might testify to what they saw or heard during a crime. However, it can also be used in everyday language when talking about supporting or confirming something. For example, you might say "I can testify to the quality of this product because I have used it myself and it works well." In other words, you are providing evidence to support the quality of the product.