灰岩干谷是由于扩大而形成的一个大的拉长的天坑。
Uvala is a large elongate sinkhole resulting from enlargement.
纳米管是由碳原子拉长的空心圆筒。
The nanotubes are elongated, hollow cylinders of carbon atoms.
海风和水流已将浮油原本的形状改变为飘带状和拉长的片状。
Wind and water currents patterns have modified the oil spill's original shape into streamers and elongated masses.
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