才
Pinyin: cái
only then; just now; only (so few, so little)
Example sentence
教外国人中文的时候才会发现自己中文有多差。
Jiāo wàiguórén Zhōngwén de shíhou cái huì fāxiàn zìjǐ Zhōngwén yǒu duō chà.
It's when you teach foreigners Chinese that you realize just how flawed your own Chinese is.
What 才 means
才 (cái) is an Chinese word meaning “only then; just now; only (so few, so little)”. It appears in the HSK 3 collection (and also in HSK 5).