笛;The cave was echoing with shouts.
山洞内
荡着叫喊声。
音；反照现象；呼应
，呼应（echo的现在分词）The cave was echoing with shouts.
山洞内荡着叫喊声。
It receives its name from the echoing Shhhh that the sand makes as you step on its surface.Visitors here can try camel rides, can parasail, can slide the dunes or simply build sand castles.
湾为漠中的一月牙形丘，从丘顶部滑下，子会发出轰鸣声，形成著名的“”
观，是罕见的自然景观。
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