他们补充道，还有其他三个因素导致了这一趋势。

Three other factors contribute to the trend, they add.

youdao

但他们补充说，没有作出决定的大规模接种在美国。

But they add that no decision has been made on mass-inoculations in the United States.

youdao

他们补充说，肥料从周围的农田被冲进海里，加剧了问题。

They added that fertilizers from surrounding agricultural land were being washed into the sea and exacerbating the problem.

youdao

There will be a packet that you can order from RIS that gathers a few supplementary readings.

你们可以从RIS出版社订购,他们的版本还添加了一些补充阅读。

耶鲁公开课 - 现代诗歌课程节选