英语语法分析

The iPhone is two years old, Gruber points out. What was exciting about it is now common.

Gruber指出iphone推出已经两年了，人们对它的兴奋劲已经趋于平淡。

In other words, Gruber is a real authority, and the obvious person to fill a needed role.

换句话说，格鲁伯是一个真正的权威，显然是填补需要的合适人选。

Gruber has spent years developing such a model, which is maintained and update at considerable expense.

格鲁伯已花费数年建立这样一个模型，它的维持和更新都花费了相当大的代价。