尽管我们费了很大的劲，也无法直接觉察发射台发出的电视信号。

六、as引导比较状语从句

　　as引导比较状语从句，其基本结构是as…as。前一个as是副词，后一个as是比较状语从句的连词。否定结构为not so much … as …。

　　例1：Small as it is, the ant is as much a creature as are all other animals on the earth.

　　尽管蚂蚁很小，但是它同地球上的任何其他动物一样，也是一种动物。

　　例2：It was not so much the many blows he received as the lack of fighting spirit that led to his losing the game.

　　与其说是他受到了许多打击，还不如说是缺乏斗志使他输掉了比赛。