[zhèng hǎo]
（恰好） just in time; just right; just enough
You've come just at the right moment.
你來得正好。
When you knock off work, you'll be just in time to catch that bus.
你下班時坐這趟車正好。
This hat fits me nicely.
這帽子我戴著正好。
This jacket fits me perfectly.
這件衣服我穿正好。
It happened that I was also here.
正好我也在這里。
At the moment the clock struck twelve, I chanced to wake up.
我一覺醒來， 鐘正好打十二點。
The two brothers have exactly opposite temperaments: one likes to be active while the other tends to be quiet and keep to himself.
他們弟兄兩個脾氣正好相反， 一個愛動， 一個好靜。