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，可以收听真人发音 
小测验：选择正确的单词
- 论坛新贴
cusp [kʌsp]
基本释义
- n. 尖头,尖端,尖头
英英解释
3个名词解释
- point formed by two intersecting arcs (as from the intrados of a Gothic arch)
- a thin triangular flap of a heart valve
[同] cusp, leaflet
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3
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