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单词 listening gallery
释义

> as lemmas

listening gallery
listening gallery n. Fortification (see quot. 1872-6).
ΘΚΠ
society > armed hostility > defence > defensive work(s) > earthwork or rampart > [noun] > listening gallery
ecoute1806
listener1828
listening gallery1833
1833 H. Straith Treat. Fortif. §213. 160 Listening galleries.
1872–6 G. E. Voyle Mil. Dict. (ed. 3) Ecoutes, listening galleries... These galleries are run out under and beyond the glacis at regular distances in the direction of the besiegers' works, and enable the besieged to hear and estimate how near the besiegers have carried their mining operations.
extracted from listeningn.
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