松紧

例句：

1. 1.The elastic band is used to adjust the waist of the dress.
   弹性带用来调整连衣裙的腰围。
2. 2. The tightrope walker must be very careful not to lose their balance.
   走钢丝的人必须非常小心，以免失去平衡。
3. 3. The project was completed on time, showing good organization and coordination.
   该项目按时完成，显示出良好的组织和协调能力。