You stress the first syllable in 'happiness'.

happiness一词重读第一个音节。

《牛津词典》

The emphasis is on the first syllable of the last word.

重音是在最末一个单词的第一个音节上。

《柯林斯英汉双解大词典》

When I asked about this unusual word, she said that she used the first syllable from each nationality.

当我问这一怪词时，她说她用了每个国家的第一个音节。

youdao

You can call me Ja, the first syllable.

您可以叫我杰，第一个音节。

麻省理工公开课 - 电影哲学课程节选

You can use my first syllable.

你可以用第一个音节称呼我。

麻省理工公开课 - 电影哲学课程节选

If Macbeth talked about the "last syllable of recorded time", the proto-Elamites were there for the first.

BBC: Breakthrough in world's oldest undeciphered writing