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1·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.

板条长度方向散热不均匀及两块热沉之间散热能力的差异对波前畸变的影响很小，而宽度方向散热不均匀对波前畸变的影响较大；