This is to ensure that no permanentstrain occurs to the load cell which could affect its calibration.
这是为了确保没有永久应变发生负载细胞，这可能会影响其校正。
2
When the load is removed, the elastic portion of the strain is recovered, but the plastic part (slip and creep) remains as permanent set.
当荷载被移走时，应变的弹性部分恢复，但塑性应变部分(滑移和徐变)却会永久呆留。
3
As any parents of a young child who is a problem sleeper will confirm, permanent tiredness and constant irritability can put a huge strain on your relationship.