1. The steelyard is used to measure the weight of heavy objects.
衡器被用来测量重物的重量。
2. The merchant used a steelyard to weigh the goods before selling them.
这个商人在卖货之前用钢杆秤来称量商品。
3. The steelyard was an important tool for trade during ancient times.
在古代，钢杆秤是贸易中重要的工具。