calichen.
英 kə'liːtʃɪ | 美 kə'litʃi
中文n. 生硝；钙质层
词根词源
caliche (n.)sodium nitrate deposits in Chile and Peru, 1858, from American Spanish, from Spanish caliche "pebble in a brick," from Latin calx "pebble" (see chalk (n.)).
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