原因之一是

原因 yuanˊ yinˉ

(Cause, Causes, Factor, Factors, Reason, Reasons) Cause , Reason , Factor , Cause, Causes, A cause, The cause, The causes, Reason, Reasons, A reason, The reason, The reasons, Factor, Factors, A factor, The factor, The factors

原因之一 yuanˊ yinˉ zhiˉ yiˉ

(One of the, One reason, One reason for) One reason, One reason for, One of the reasons, One of the reasons for

之一 zhiˉ yiˉ

(One of) One of

是 shiˋ

Is, To be, Am/Are/Is/Was/Were, Being, Yes