我确定我们将成为心中挂念的事

I know for sure that what we dwell on is who we become.

我确定我们将成为心中挂念的事 

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宾语从句that what we dwell on is who we become

宾语从句里又包含两个从句：

——主语从句what we dwell on

——表语从句who we become