求翻译：通过对筒体内部表面裂纹处染料渗透测试后发现，无论是在母材还是在焊缝上，裂纹扩展都呈典型的河流状，并有分支现象（图3箭头1，4所指处）是什么意思？

Cylinder internal surface crack at the dye penetration test, whether it is in the parent metal or weld on the crack propagation radiate a typical river-like and has a branch (Fig. 3 arrows 1,4 within the meaning of Department)

And inside the body through the surface cracks, dye penetration test, whether it was in the parent material or in seams, cracks, expansion is typical of the river, and has branch offices (figure 3 arrow in 1, 4 as indicated by)

Through discovered after the tube body interior surface crack place dye seepage test, regardless of is in the parent metal or on the welded joint, the fracture growth all assumes the model the rivers shape, and has the branch phenomenon (Figure 3 arrow 1,4 to refer place)

Through a tube after a dye penetration test of internal surface cracks found on both the base material and the weld, crack are typical of rivers, and branching phenomenon (Figure 3 arrows 1, referred to in 4)

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