求翻译：比赛开始时，将尺子的中点靠在桌子的中线上，在裁判员发出“开始”命令后，参赛的同学方可将尺子往自己这边拉（手臂不可离开桌面），先将尺子拉过中线的一方为胜。是什么意思？

Beginning of the race, the midpoint of the ruler against the table in the line, the referee issued a "start" command, participating students will be ruler to pull their side (the arm can not leave the desktop), the first ruler to pull off neutral party to victory.

正在翻译，请等待...

When the competition starts, depends on the ruler center point in the table median line, sends out “the start” after the referee the order, participative schoolmate only then pulls the ruler toward oneself (arm not not separable to open tabletop), has pulled first the ruler median line Fang Weisheng

Competition at the beginning of on the midpoint of the ruler in the middle of the table, the referee issued the "start" command, the participating students to be the ruler to your side (arm must not be separated from the desktop), the first ruler pulls up the Middle route of the party for the victor

Competition at the beginning of on the midpoint of the ruler in the middle of the table, the referee issued the "start" command, the participating students to be the ruler to your side (arm must not be separated from the desktop), the first ruler pulls up the Middle route of the party for the victor