Meaning of biàn:
变
to change; to become different; to transform; to vary
Tā de tàidù tūrán fāshēng le biàn.
他的态度突然发生了变。
His attitude suddenly changed.
Tiānqì kāishǐ biàn liáng le.
天气开始变凉了。
The weather is starting to become cooler.
Dōngtiān láile, yīqiè dōu kāishǐ biàn lěng.
冬天来了,一切都开始变冷。
Winter is coming, and everything is starting to turn cold.
Tiānqì zǒng shì zài bùduàn de biàn huà.
天气总是在不断地变化。
The weather is constantly changing.
rebellion
Lìshǐ shàng yǒu hěnduō biàn fāshēng.
历史上有很多变发生。
There have been many rebellions throughout history.