weight concentrated in the back

例句：

1. 1.The weight of the luggage was too much for me to carry.
   行李的重量对我来说太重了，我无法携带。
2. 2. He weighed 180 pounds and was very fit.
   他重180磅，非常健康。
3. 3. The weight of the snow is enough to make a car sink.
   雪的重量足以让一辆车沉下去。