青少年们爬了数十层楼梯，为困在高层建筑中的老人们送去水和食物。
Teenagers climbed dozens of flights of stairs to deliver water and food to elderly people trapped in high-rise buildings.
一些牙球有数十层，每层有镂空花纹并能旋转。
Some have dozens of rings or layers, and each ring is carved with hollowed designs and able to revolve.
一些牙球有数十层，每层有镂空花纹并能旋转。
Some have dozens of rings or layers, and each ring is carved with hollowed designs and able to revolve.
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