Of if is concave up on one side of and concavedown on the other side.
点，如果在点的一侧是凹的，而在的另一侧是凸的。
2
When water is pumped out of a chamber below the plate creating negative pressure, the stretchable sensors are pulled down, producing a concave shape.
当水从板下的一个腔中被抽出来产生负压时，可伸缩的传感器被向下拉，形成一个凹形。
3
The most obvious response of building under uneven settlement occurs at the bottom story; and its ability to resist downconcave deformation is stronger than that to upper convex deformation.