褐球在发球线（Baulk-Line）即D区之中心点上。
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baulk line 开球线
Baulk-line and Baulk 发球线及发球区
line and Baulk 发球线及发球区
同义词： balkline baulk-line string line
以上来源于: WordNet
N a straight line across a billiard table behind which the cue balls are placed at the start of a game (台球)开球线 (Also called string line) [billiards]
Place the cue ball on the brown spot and attempt to hit it along the baulk line.
把主球放在棕球置点上，试着使其在被击打后沿着发球线滚动。
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