But that distant echo was the only response produced by Neb's shouts, while a heavy gloom hung over all the part east of the island.

可是回答纳布呼唤的只是遥远的回声，而小岛整个的东部却是一片昏暗。

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To test for the ringing acoustic signatures of tiny bubbles, physicist Helen Czerski of University of Rhode Island has devised a specially-designed echo chamber about the size of a soccer ball.

为了测试微小气泡的声学特征，罗得岛大学物理学家海伦切尔斯基制定了一个足球大小的特别回音球。

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