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洞ほら
hollow, cavity, hole, cave
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洞窟どうくつ
cave, cavern, grotto
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洞穴ほらあな
cave, cavern, den, grotto
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洞察どうさつ
discernment, insight
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空洞くうどう
cavity, hollow, cave, cavern
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鍾乳洞しょうにゅうどう
limestone cave, limestone cavern
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洞どう
sinus, cavity, antrum
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洞角どうかく
hollow horn, cavicorn
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洞見どうけん
insight, discernment
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洞門どうもん
cave entrance, tunnel
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洞毛どうもう
(animal) whiskers, vibrissae
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洞道とうどう
service tunnel (cables, gas, etc.)
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洞房どうぼう
sinoatrial
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洞簫どうしょう
dongxiao (Chinese bamboo flute similar to a shakuhachi)
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膣洞ちつどう
vaginal cavity, vagina
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仙洞せんとう
residence of a retired emperor, dwelling of a former emperor
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風洞ふうどう
wind tunnel
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窩洞かどう
dental cavity (due to caries)
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樹洞じゅどう
tree hollow, hollow in a tree
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類洞るいどう
sinusoid
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雪洞せつどう
snow cave
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雪洞ぼんぼり
paper-covered lamp or lantern
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晶洞しょうどう
druse, globular calcium oxalate crystals, often lining a rock cavity
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洞調律どうちょうりつ
sinus rhythm
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洞井守ほらいもり
olm (Proteus anguinus)
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洞結節どうけっせつ
sinus node, sinoatrial node
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洞窟熊ほらあなぐま
cave bear (extinct, Ursus spelaeus)
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洞察力どうさつりょく
insight, discernment, perception, perspicacity, acumen
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静脈洞じょうみゃくどう
venous sinus, sinus venosus
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曹洞禅そうとうぜん
Soto Zen
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曹洞宗そうとうしゅう
Soto school (of Zen Buddhism)
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空洞化くうどうか
making hollow, making meaningless
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晶洞石しょうどうせき
geode
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石灰洞せっかいどう
limestone cave
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小洞燕しょうどうつばめ
sand martin (Riparia riparia)
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海食洞かいしょくどう
sea cave, marine cave
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溶岩洞ようがんどう
lava tube
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超空洞ちょうくうどう
void
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洞窟潜水どうくつせんすい
cave diving
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洞窟壁画どうくつへきが
cave painting
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洞房結節どうぼうけっせつ
sinoatrial node
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溶岩洞穴ようがんほらあな
lava cave
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洞性不整脈どうせいふせいみゃく
sinus arrhythmia, irregular heartbeat
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洞窟の女王どうくつのじょおう
She: a History of Adventure (1887 novel by H. Rider Haggard)
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空洞化現象くうどうかげんしょう
hollowing-out phenomenon
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台湾小洞燕たいわんしょうどうつばめ
brown-throated martin (Riparia paludicola), brown-throated sand martin
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空洞共振器くうどうきょうしんき
cavity resonator, microwave resonance cavity, rhumbatron
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洞不全症候群どうふぜんしょうこうぐん
sick sinus syndrome, sinus node dysfunction, SSS
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洞爺湖サミットとうやこサミット
G8 Hokkaido Toyako Summit, Hokkaido Toyako G8 summit
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洞ヶ峠を決め込むほらがとうげをきめこむ
to wait for a good opportunity, to come down on the right side of the fence, to see which way the cat jumps, to wait and see at Horagatoge