裂纹

• Crack propagation usually begins slowly .
  裂纹的增长常常是开始缓慢。
• Opacity is due to crazes in the resin .
  不透明是因树脂中产生裂纹。
• A craze is a thin platelike region .
  小裂纹是一个类似薄片的区域。
• The crack eventually caused the chord to fracture .
  裂纹最终致使弦杆断裂。
• The engine cracked on the first test flight .
  在首次试飞时，发动机发生裂纹。
• All holes were positioned at the tip of the crack .
  所有的孔都位于裂纹的尖端。
• Listed in column 2 are descriptions of the cracking .
  第二纵列是关于裂纹的描述。
• Floor-beam webs have cracked in tied arch bridges .
  在系干拱桥的横梁腹板上发生裂纹。
• The bowl has a crack in it .
  这只碗上有条裂纹。
• Crazing is the invariable precursor of brittle fracture .
  出现小裂纹必然是脆性断裂的前兆。