testing abrasion of aggregates

例句：

1. 1. The engineer is testing the new machine for accuracy.
   工程师正在测试这台新机器的准确性。
2. 2. The scientist conducted a thorough testing of the new drug.
   科学家对这种新药进行了彻底的测试。
3. 3. Before making any decisions, we need to conduct thorough testing.
   在做出任何决定之前，我们需要进行彻底的测试。