Two area defects are twins and grain boundaries.

有两种面积缺陷，即孪生和晶粒间界。

Two area defects are twins and grain boundaries .

有两种面积缺陷，即孪生和晶粒间界。

Preferential corrosion cracking at or along the grain boundaries of a metal.

优先腐裂或沿着金属晶界发生的腐蚀。