I must turn on the closed captioning.

我跟不上，我必须把字幕机打开了。

The site also supports dynamic captioning of photos by visitors.

这个站点也支持根据不同的访问者而动态改变图片的标题。

In fact, image captioning has been made default feature, and always turned on or enabled.

事实上，在图像字幕已取得预设功能，始终把对或启用。

Note: The closed captioning check boxes are greyed out if you the slide does not contain an audio.

注： 如果你的幻灯片不包含声音，则隐藏式字幕复选框是灰的。

If you're hard of hearing, or just want to mute the volume on a show, Close Captioning is available as well.

如果听不清楚，或者只想关闭节目中的声音，这都没问题，你还可以关闭字幕显示。