从二十世纪六十年代起，护河者这样的组织，以及民谣歌手皮特•西格这样的倡导者，一直竭力恢复哈德逊河的生态系统。

Since the 1960s, groups like Riverkeeper and advocates such as Pete Seeger, a folk singer, have fought to restore the river’s ecosystem.

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从二十世纪六十年代起，护河者这样的组织，以及民谣歌手皮特·西格这样的倡导者，一直竭力恢复哈德逊河的生态系统。

Since the 1960s, groups like Riverkeeper and advocates such as Pete Seeger, a folk singer, have fought to restore the river's ecosystem.

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早期的远程学习借助于邮政系统，现在使用的是计算机、卫星和互联网。 远程学习并不是一个崭新的概念，最早的远程学习可能是皮特曼组织于十九世纪末开设的速记课程。

The first structured distance learning or correspondence courses were probably the shorthand courses offered by the Pitman organization at the end of the 19th century.

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