tā / shì / zhèng / shì / suǒ / shēng / de / dí / zǐ / dì / wèi / yǔ / shù / zǐ / bù / tóng

他是正室所生的嫡子，地位与庶子不同。

He was the legitimate son born of the main wife, with a different status from the concubine's son.