其中之一就是

其中 qiˊ zhongˉ

(Among, From among, Within) Within, Among, From among

其中之一 qiˊ zhongˉ zhiˉ yiˉ

(One of, One of them) One of, One of them

之一 zhiˉ yiˉ

(One of) One of

就是 jiuˋ shiˋ

(And so, Exactly, Namely, That is) That is, Namely, Exactly, And so is, And so are