收缩筋

例句：

1. 1. Thesteel is contracting due to the coldweather.
   由于寒冷的天气，钢材正在收缩。
2. 2. The agreementwas a contract between the twocompanies.
   这项协议是两家公司之间的合同。
3. 3.The government has been contracting with privatefirms for the construction of roads.
   政府一直在与私营公司签订合同来修建道路。