tracing ball
美
[ˈtresɪŋ bɔl]
英
[ˈtreɪsɪŋ bɔ:l]
[计] 跟踪球
Examples
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美[ˈtresɪŋ bɔl]英[ˈtreɪsɪŋ bɔ:l]
[计] 跟踪球