However, the zig-zag and discontinuous microscopic growth path of fatigue cracks with some branching cracks expanded locally was observed.
但从微观上看，裂纹的微观扩展路径曲折、不连续，常伴有分枝裂纹的形成。
2
The zig-zag optical path can eliminate the influence of the non-uniform heat dissipating capacity in length and height directions, but not in width direction.