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关于线的概念:“线”从数学上讲只有长度而没有宽度。但在使用中,存在着粗略和精确两种概念。粗略的概念是便于眼睛观察。如,由比赛线围成的比赛场地,比赛线宽1～5厘米,5厘米的宽度主要是适应在草地上进行比赛。如草太高用较细的边线就不太清晰。比赛线内为场内,比赛线外为场外。而精确的概念是便于测定和判决。如比赛场地的长和宽,都是以比赛线的外沿为准。球是界内球还是界外球,是依比赛线的外沿为准。是否出界也是以球的整体是否越过比赛线外沿为判断依据。
The concept of line: “Line” mathematically only length without width. However, in use, there are two kinds of rough and precise concepts. The rough idea is to facilitate eye observation. For example, the competition area surrounded by the competition venues, the race line width of 1 to 5 cm, 5 cm width is mainly adapted to match in the grass. Grass is too high with thinner edge is not very clear. The game line for the field, outside the game line for the off-site. The precise concept is easy to measure and decide. Such as the length and width of the game are based on the outer edge of the game line shall prevail. Ball is the ball inside or outside the ball, is based on the race line of the outer edge prevail. Whether out of bounds is based on whether the whole ball across the outside of the game line to determine the basis.