standard cross-section

例句：

1. 1.The standard for measuring the length of a ruler is 20 cm.
   测量尺的标准长度是20厘米。
2. 2. The company's product line follows industry standards.
   该公司的产品系列遵循行业标准。
3. 3. Standardization is essential for ensuring quality in manufacturing.
   标准化对于保证制造业的质量至关重要。