checking investigation of sampling

例句：

1. 1. The police are conducting a thorough checking of the crime scene.
   警方正在对犯罪现场进行彻底的检查。
2. 2.The company is carrying out an internal checking to identify any potential risks.
   公司正在进行内部检查，以识别任何潜在的风险。
3. 3. Before signing the contract, we conducted a thorough checking of the terms and conditions.
   在签署合同之前，我们对条款和条件进行了彻底的检查。