She said the government was still conducting tests to determine the source of the outbreak.

她说，政府仍在进行检测，以确定疫情的来源。

Despite many attempts from experts, no one has ever been able to determine the source of the following audio.

尽管专家们进行了多次尝试，但始终没有人能够确定以下音频的来源。

What we have done is we’ve tried to focus our attention using genetics to determine the source of the actual poaching and to figure out how many major source populations are there.

我们已将注意力转移到运用遗传学来确定真正的偷猎来源，并找出主要偷猎者。