gravity block wire-drawing machine

例句：

1. 1.The heavy rain caused the roads to become impassable.
   大雨使道路无法通行。
2. 2. The gravity of the situation demanded immediate action.
   形势的严重性要求立即采取行动。
3. 3. The weight of the book was too much for her to carry.
   这本书的重量对她来说太重了，她扛不动。