... preferences dialog box 系统配置对话框，对话方块 preferential attack 优先腐蚀 preferential etching 择优腐蚀，择优浸蚀 ...
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优先腐裂或沿着金属晶界发生的腐蚀。
Preferential corrosion cracking at or along the grain boundaries of a metal.
实验结果发现，试样表面出现大量的氧化腐蚀坑，表面主裂纹优先通过这些腐蚀坑扩展。
Plenty of oxidation etching pits are found on the surface of the specimen after the thermal fatigue test, and the surface principal crack is prone to propagate through these etching pits.
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