便是 (biàn shì) means “(emphasizes that sth is precisely or exactly as stated); precisely; exactly; even; if; just like; in the same way as”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
眼前这位便是我的老师。
Yǎnqián zhè wèi biàn shì wǒ de lǎoshī.
The person before you is precisely my teacher.
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