canary in a coal mine
(idiomatic) Something whose sensitivity to adverse conditions makes it a useful early indicator of such conditions; something which warns of the coming of greater danger or trouble by a deterioration in its health or welfare.
A knowledge of how to make something work without deeper theoretical understanding of why it works.
(mineralogy) A monoclinic-prismatic dark brown mineral containing aluminum, calcium, chromium, hydrogen, iron, magnesium, oxygen, and silicon.
A surname from Irish.
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DiQt（ディクト）
無料
★★★★★★★★★★
