Grinda格林达grindv.磨；压迫；碾碎；磨得吱吱响；逐渐停顿n.苦事；磨；碾grinding hardness研磨硬度grinding abrasion磨料磨损grinding undercut磨削空刀槽grinding property磨碎能力grinding capacity磨削容量grinding additive研磨辅料grinding position磨削位置Grinding movement磨削grinding to gauge磨削到标准尺寸grindability rate可磨指数

1. Find level ground for the picnic table.
   找一处平坦的地面放野餐的餐桌。
2. Early experiments with military rockets prepared the ground for space travel.
   早年对军用火箭进行的实验为发展航天技术奠定了基础。
3. Does desertion ground for divorce?
   被配偶遗弃是离婚的理由吗？
4. This citadel is built on high ground for protecting the city.
   这座城堡建于高处是为保护城市。