libraty file designator

例句：

1. 1.The libraty is used to measure the weight of objects.
   天平用于测量物体的重量。
2. 2. The scales are balanced on a table.
   秤放在桌子上平衡了。
3. 3.The balance is critical for accurate measurements.
   平衡对于准确的测量至关重要。