Gāng 刚 and gāngcái 刚才 are two words that are often used in different situations in Mandarin Chinese. Both of these words mean "just, a moment ago" and refer to actions that happened a short time ago.
But even though the meaning is the same, the use of these two Chinese words is not always the same.
The use of large numbers in Mandarin Chinese is different from many other languages. Unlike some languages that form numbers based on the number 1000 in large numbers, numbers between 10,000 and 100,000,000 in Mandarin Chinese are based on how many tens of thousands they have and a set of rules for numbers from 100,000,000 and up.