sounding lead
柯林斯詞典
1. N a lead weight, usually conical and having a depression in the base for a dab of grease so that, when dropped to the bottom on a sounding line, a sample of sand, gravel, etc, can be retrieved 測深錘
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1. N a lead weight, usually conical and having a depression in the base for a dab of grease so that, when dropped to the bottom on a sounding line, a sample of sand, gravel, etc, can be retrieved 測深錘