countersink是什么意思_countersink怎么读_音标'kaʊntəˌsɪŋk
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countersink是什么意思音标:英 ['kaʊntəˌsɪŋk]美 ['kaʊntəˌsɪŋk]
vt. 钻孔装埋, 打埋头孔于
n. 埋头孔, 锥口钻
n. a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and pe below the surface