不均勻
In many beams, the section properties are clearly not uniform. 在許多梁中，其截面特性很明顯是不均勻的。
The reason of air distribution being asymmetric is that the penetrability of the field soil is not uniform. 現(xiàn)場(chǎng)曝氣存在氣流分布不對(duì)稱現(xiàn)象，是由于土壤介質(zhì)的滲透性不均勻所致。
