The course lasted just five hours. The researchers received a certificate of attendance and were told they could earn $100 an hour to treat customers.

该课程仅持续了5个小时。研究人员拿到了在读证明并被告知招待客户，他们每小时可以赚100美元。

If you do not do so, we will not be able to give you a certificate of attendance should you require one for any particular purpose.

如果没有达到这一要求，我们就不能给你们出席证书，这个证书是实现所有特定目标的前提条件。

If you do not do so, we will not be able to give you a certificate of attendance if you should require one for any particular purpose.

如果您不这样做，如果您出于任何特定目的需要出勤证明，我们将无法为您提供出勤证明。