carry look ahead adder

例句：

1. 1. The box was too heavy for me to carry.
   这个箱子太重了，我搬不动。
2. 2. He carried the bag across the room.
   他提着包穿过房间。
3. 3. She carried a heavy load all day.
   她一整天都扛着沉重的负担。