At the second of these AD hoc conferences, as at the first, there were two chief problems the pyrogenicity of the preparations then available, and their instability.

在专案会议的第二次会议，首先，这里有两个主要问题，一个是致热原性的准备工作及可用性，它们的不稳定性。

youdao

At the second of these AD hoc conferences, as at the first, there were two chief problems the pyrogenicity of the preparations then available, and their instability.

在专案会议的第二次会议，首先，这里有两个主要问题，一个是致热原性的准备工作及可用性，它们的不稳定性。

youdao