一只年轻的灰狗第一次踏上其赛车生涯前，必须经过一系列的试验，以评估作为一名赛车手的水准，当然，他或她很可能采取当他们真正开始的比赛能力。这一般是基于他在临床试验中达到的最佳时机，它们基本上是两个或三个赛车亚军，但没有任何合法的投注。
不同的磁道，灰狗获得足够快的时间就会有所不同。当然，在不同的距离也是一样。赛车经理将进入任何年级，他觉得会给出一个公平的机会赢得与灰狗接近或相等的能力。
真正的赛车经理能够在任何特定的时间内估计任何特别的灰狗。
一个典型的分级制度，将给予一个特定的距离前缀。例如，在沃森斯，一个475米比赛有一个前缀，640米比赛有S前缀。信是跟着一个数字给人的档次或类的比赛。最低的一个是A9的事件，实例和A1的最高。
什么时候决定投注？这可以遵循赛车经理的评估或编制自己的指数，因为他们越来越有经验。
译文
When a young greyhound first embarks upon its racing career, it must undergo a series oftime trials to assess ability as a racer and which course he or she is likely to take when they actually start races. This is generally based on the best time he achieves in trials, which are basically, two or three runner racing but without any legalised betting.
Providing a greyhound obtains a sufficiently fast time, which will vary from track to track and, of course, over various distances, the racing manager will enter it in whatever grade he feels would give it a fair chance of winning against greyhounds with near or equal ability.
The grade is really the racing manager抯 estimation of any particular greyhound抯 慶lass? at any particular time.
A typical grading system would be to give a prefix for a particular distance, for instance, a 475 metres race at Walthamstow has an A prefix and 640 metres an S prefix. The letter is followed by a number which gives the grade, or class, of the race. An A9 event would be the lowest, for instance and an A1 the highest.
When deciding on lass? punters can either follow the racing manager抯 assessment or compile an index of their own as they become more experienced.
