| 单词 | base line |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔backcourt〕The part of a court between the service line and the base line in tennis and other net games.后场：在网球或其它网类比赛中在发球线和底线之间的球场部分美国传统〔foot fault〕A fault against the server, as in tennis, called for failure to keep both feet behind the base line.发球踏线：如在网球运动中，发球者因脚部踏或越过底线而犯规美国传统 |
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