"Stop" - Stops the video and quits buffering, works exactly like switching to another app and switching back.
"Minimize" - Moves the video to the tiny window at the bottom right.
"Maximize" - Makes the video full screen.
"Exit", "Close player" - Closes the video, but leaves YouTube open.
"Play on...", "Connect to..." - Starts playing the video on another device, choices are "TV", "Chromecast", or "Console." Unfortunately, you can't seem to be able to say the name of the device (such as a Chromecast's name).
"Disconnect from..." - The opposite of the last command, stops playing the video on a remote device.
"Skip ads" - Somewhat self-explanatory.
其實YouTube 集成Google NOW 語音操作有一段時間