1.
As we settled back in our rooms the doorbell rang again in an oddly hollow ring.
但我们回到卧室后，门铃又发出了一种奇怪的空洞的声音。
2.
as if echoing in a hollow space.
好像空洞里的回声一样。
3.
a device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound.
强迫空气或蒸汽滑过边缘或者进入洞穴以产生大的声音的装置。
4.
Along the Paris streets, the death-carts rumble, hollow and harsh.
死亡之车在巴黎街上隆隆驶过，声音空洞而刺耳。
5.
Their voices echoed round the cave.
他们的声音在洞穴中激起回响.
6.
The cry proceeded from the grotto.
那声音是从地洞那面传过来的。
7.
sonic barrier
【空】声垒, 音障
8.
Excessive noise is an indication that cavitation is occurring.
噪音太大是发生空洞现象的一个征兆。
9.
Air is the common medium of sound.
空气是声音的普通介质。
10.
Air is the medium of the sound.
空气是传播声音的介体。
11.
Air is a medium for sound.
空气是声音的传播媒介。
12.
He was startled by the sound of a deep, hollow voice booming and a banging on a wooden table.
忽然有人发出深沉、空洞的洪亮声音，砰的敲了一下木头桌子，把他吓了一跳。
13.
To brag or make loud, empty threats.
恐吓吹牛或作大声的、空洞的威胁
14.
empty threats, words, promises, dreams
虚张声势的恐吓、 空话、 空洞的许诺、 虚幻的梦想
15.
The damp air vibrated with the smooth hum of machinery.
惨黄的电灯光映射在丝车间的许多窗洞内，丝车转动的声音混合成软滑的骚音，充满了潮湿的空间。
16.
Facing the Purple Bamboo Grove is Chao'Yin'Dong or Pounding Waves Cave whose pecular rock formation makes it echo like thunder when the tide rushes in with the winds.
紫竹林前，是“潮音洞”。 此洞造形奇特，潮水借着风势，奔入洞中时，会发出雷鸣般的响声；
17.
Facing the Purple Bamboo Grove is Chao'Yin'dong or Pounding Waves Cave whose peculiar rock formation makes it echo like thunder when the tide rushes in with the winds
紫竹林前，是“潮音洞”。此洞造形奇特，潮水借着风势，奔入洞中时，会发出雷鸣般的响声
18.
(informal) with a short hollow thud.
（非正式）有一个弱的、落进空洞里的重击声。