数字4通常也被取代成for，就像2这个音就替代了to。
The number 4 is also common as a replacement for the for sound as is 2 for to.
这些平原内的河流交叉成网，四通八达，河面宽度大多在20米到50米之间，水深在3米到5米左右。
These plain within the river cross into the net, extending in all directions, mostly in the river width of 20 meters to 50 meters water depth of 3 m to 5 meters.
将圆形管件焊接成三通、四通等是焊接行业经常遇到的工艺。
Three-way or four-way round pipe welding is a common technique in practice.
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