An aquifer is a water - bearing rock stratum such as sandstone and chalk.地下蓄水层是一些有水的岩石层,如沙岩和白垩岩.The coal is a coal resource that reserves in old stratum.石煤是贮藏在古老地层中的一种煤炭资源.A portion of bedrock or other stratum protruding...
Cracks will occur in the region of the thyroid cartilage because of deglutition.甲状软骨部分会由于吞咽动作而龟裂.Function of chewing, deglutition, respiration and speech was restored well.患者咀嚼 、 吞咽 、 呼吸、语言功能恢复良好.Swallowing ( or deglutit...
The stair treads were covered with rubber to prevent slipping.楼梯踏板上覆盖着橡胶以防滑.During Christmas everybody treads on air.圣诞节期间每个人都喜气洋洋.He unwarily treads upon a viper asleep just before his feet.他不小心踩到正睡在他脚前的蛇上....