For hints about the available commands, you can press? At any time and the options will show on screen.

要获得可用命令的提示，您可以在任何时刻按？键，然后命令的选项就会出现在屏幕上。

youdao

My brief lesson hints at the phenomenal amount of work involved in reaching a point where that accent convinces on a giant screen, in surround sound and over a two-hour running time.

BBC: How not to do an American accent