Maybe it's a class that's got, like, three tests.

也许这门课有三个测试。

As the first week of the experiment is coming to an end, she's decided to give the class a surprise physics test to see if they're actually learning anything.

随着试验的第一周临近尾声，她决定给全班同学来一个突击物理测验以检验他们是否真的学到了什么。

" ... we've managed to identify a critical step in the process and are now testing a new class of drugs which should specifically block this step and stop the disease."

“.......我们已经发现导致这种病的一个关键过程，并正在测试一种可以阻止该过程发生且治愈该疾病的新药。”