This is the 272nd most frequent Chinese word.
白
"White" or "pure."
In this sentence, '白' describes the color of snow, representing 'white.'
白雪覆盖了整个大地。
The white snow covered the entire land.
Here, '白' is used figuratively to mean 'in vain' or 'for nothing,' indicating wasted effort.
他白跑了一趟，事情已经解决了。
He went on a trip in vain, as the issue was already resolved.
In this sentence, '白' is part of '白天,' which means 'daytime,' derived from the literal meaning of 'white' to represent brightness during the day.