gravity skyline system

例句：

1. 1. The gravity of the situationdemands immediate action.
   形势的严峻要求立即采取行动。
2. 2. The weight of the book was toomuch for me to carry.
   这本书的重量对我来说太重了，我搬不动。
3. 3. The gravityof his words made her feel deeply moved.
   他的话的严肃让她深受感动。