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单词 Secchi disk
释义 Secchi diskn.(名词)
  1. A disk, divided into black and white quarters, used to gauge water clarity by measuring the depth at which it is no longer visible from the surface.透明度盘:分为黑白两色四等份的圆盘状物,借着测量从水表不可见的深度来测定水的清澈度
Etymology语源
  1. After Pietro Angelo Secchi (1818-1878), Italian astronomer hired to test such a disk After Pietro Angelo Secchi (1818-1878), Italian astronomer hired to test such a disk
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