If only an image is used, the ToolItem needs to have a ToolTip (phrase or sentence of help information) that will be presented when the mouse is over the ToolItem to explain the function the image.

如果仅使用图片，那么ToolItem需要有一个ToolTip(帮助提供信息的短语或句子)，这样当鼠标停留在ToolItem上时，会显示ToolTip，解释图片的功能。

youdao

In this function, the arguments are the phrase (what is to be said) and the voice (which Festival voice will be used to render it).

在此函数中，参数是短语(要说的内容)和声音(将用于呈现内容的Festival声音)。

youdao

The exec function calls on Festival in batch mode to do two things: Set up the voice and enunciate the phrase using the specified voice.

exec 函数以批模式调用 Festival 来做两件事：设置声音和使用指定的声音说出短语。

youdao

Other pluses were quizzes, the option of clicking on every Japanese phrase to hear it read by a native speaker and a dictionary function that had about 660 words.

WSJ: Mobile Apps for Foreign Languages