1. In physics, elastance refers to the ability of a material or system to resist deformation and return to its original shape. （在物理学中，弹性是指一种材料或系统抵抗变形并恢复到原来形状的能力。）
2. The elastance of the rubber band allows it to stretch and then spring back into shape.（橡皮筋的弹性使其能够拉伸并弹回原状。）