This revolution was primarily a dry farming operation with springs and shallow hand-dug wells supplying domestic needs . 这次革命主要是旱田耕作而以泉水和人工开挖浅井提供生活用水。
2.
The algorithm works for both joint sets and for any joint system where each joint has its own direction 岩体的边界可以是任何自然岩石边坡与人工开挖的任何岩体表面。
3.
Side - slope greening is art important measure to ecological remediation and soil and water erosion prevention for artificial side - slopes 摘要边坡绿化防护是对人工开挖建设形成的各种坡面进行生态修复以及防止水土流失的一项重要措施。
