Then, it's a set phrase and the word 'girl' is a little higher in pitch.

这是一个固定词组，“girl”这个词的音调要高一些。

'cell phone' is a set phrase whose 'cell' is higher in pitch ... releases a chemical called dopamine...

“Cell phone" 是一个固定短语，其中单词“cell”音调较高… 释放一种叫做多巴胺的化学物质… .

We're going to use a set phrase.

我们将使用固定短语。

Is a set phrase meaning " It was good to see you" . In this case, Mark was glad to see Kyoko again, so he said, " It's good to see you again" .

また会えてよかったです。

" That was good" . More naturally, " That's great" ! in English. This is a set phrase you can use whenever you hear good news. Now you try! Say Mark's line after Yoshi speaks.

いそがしいです。でも元気です。