| 单词 | 圆盘状物 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔Secchi disk〕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美国传统 |
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