walking across和 across,through,crossing,acrossing哪个意思一样吗

walking across / acrossing 步行穿过
I saw some people walking across the bridge.
我看见一些人走过那座桥.
walking through 穿行
Imagine: two turtles are walking through the desert.
想像一下：两只乌龟慢慢的穿越沙漠.
crossing n.人行横道,十字路口；交叉,相交；横越；渡口
walking crossing 是 动词接名词的形式.