a a great number of

The safety of a racer is very important here that's why the safety cage is made of a a great number of thick tubes.

在这里赛车手的安全是非常重要的，这也是为什么安全箱要有这么多的细管组成。

Associating a number as one of the qualities of a specific object is a great hindrance to the development of a true number sense.

把数字和一个具体物品的一种属性联系起来，是形成真正的数感的一大障碍。

It has now reached a point where a growing number of people believe that it is far too high, and that bringing it down will be one of the great challenges of the twenty first century.

现在，到了越来越多人认为它太高了的程度，而且使它降低将是21世纪最大的挑战之一。