Moreover, as the PTC points out, in spite of the proliferation of viewing options, broadcasters remain pre-eminent.

此外，正如美国电视家长协会指出的那样，尽管现在观众有更多的观看选择，广播公司们还是首选。

This is no doubt why San Francisco Opera is offering an online viewing option.

毫无疑问，这就是旧金山歌剧院提供在线观看选项的原因。