Commercial gaas epitaxial layers are of good enough quality that losses due to material and interface perturbations are negligible . 市售GaAs外延层的质量相当高，故其材料和界面起伏引起的损耗可忽略不计。
2.
A section of ( wing trailing - edge ) flap detached during flight probably due to material fatigue 一段襟翼在飞行中掉落可能因材料疲乏。
3.
Commercial gaas epitaxial layers are of good enough quality that losses due to material and interface perturbations are negligible 市售gaas外延层的质量相当高，故其材料和界面起伏引起的损耗可忽略不计。
4.
The large physical size and limited isolation ( due to materials requirements and construction ) make this type of relay a poor choice for signal switching 较大的物理尺寸和受限的隔离（由于材料和构造的要求）使这类继电器不适合于信号切换。
