The velocities are independent of hydrostatic pressures.速度与流体静压力无关.The momentum of the particles was deduced from meteoritic velocities.粒子的冲量可以从陨石速度推导出来.In experimenting we find out that sound travels with different velo...
她用镐和平锹挖地基。She dug the foundation with a pick and shovel.碎砖石可以用来铺路基和庭院地基。Brick rubble is useful as the base for paths and patios.如果地基不牢，房子将会倒塌。If the foundations are flawed the house will come tumbling down....