long(gross)ton

例句：

1. 1.The cargo ship can carry up to 50 long tons of cargo.
   这艘货船可以装载多达50吨的货物。
2. 2.The coal mine is producing a long ton of coal every day.
   煤矿每天生产大量的煤炭。
3. 3. The engineer calculated the weight of the materials based on their long ton measurements.
   工程师根据材料的长吨测量值计算了材料的重量。