sink holes
A surname.
A laser that operates by analogy with an electronic waterfall, with electrons cascading down a series of small steps emitting a photon at each step.
plural of sink hole
plural of isotope
豪雨の後、古い田舎道に陥没穴が現れ、当局は修理が終わるまで通行止めにせざるを得ませんでした。
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DiQt
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