224. Even at current prices, a navigation computer is impressive.

译文　就是以现在的价格来衡量，一台导航电脑也是相当昂贵的。

点睛　本句的主干是...a navigation computer is impressive。even at current prices为副词性短语作状语，表示状态。

current意为“目前的，现在的”。如：

This word is no longer in current use. 这个词现在已经不再使用。

navigation意为“航行；导航”。如：

Navigation is difficult on this river because of the hidden rocks. 因为河中有暗礁，所以在这条河上航行很困难。

考点归纳　impressive的本义是“使人印象深刻的”，但是在具体语境中，它的含义会有一些变化。如：

The wedding was an impressive affair, with many guests. 婚礼办得很热闹，来宾很多。

It was a big face, impressive, well modeled. 他的面庞很大，五官很端正，使人印象深刻。

He drops an impressive-looking batch of cards down on the desk. 他把厚厚的一叠卡片扔在书桌上。

She put on an impressive turn of speed to overtake the others. 她突然奋力加速，力图超过别人。