[zhèng hǎo]
（恰好） just in time; just right; just enough
You've come just at the right moment.
你来得正好。
When you knock off work, you'll be just in time to catch that bus.
你下班时坐这趟车正好。
This hat fits me nicely.
这帽子我戴着正好。
This jacket fits me perfectly.
这件衣服我穿正好。
It happened that I was also here.
正好我也在这里。
At the moment the clock struck twelve, I chanced to wake up.
我一觉醒来， 钟正好打十二点。
The two brothers have exactly opposite temperaments: one likes to be active while the other tends to be quiet and keep to himself.
他们弟兄两个脾气正好相反， 一个爱动， 一个好静。