surface defect的用法和样例：
例句
- With the augmentation of grain size, surface defects of the manganese zinc ferrite nanocrystallines minish, and intergranular free volume combines.
随着粒径的增大，纳米晶的表面缺陷减小，晶界间的自由体积发生复合。 - Cracks leading to spalling were initiated at surface defects and boundaries between nitriding layes and the core.
导致剥落的疲劳裂纹开始于表面缺陷和氮化层与心部交界处。
