冠词的特殊位置（续）
（2）how(多么) so(如此) too(太) +形容词+a/an +单名 as(如此)[它属于as…as句型] We must determine how large a force is required to lift this stone. This is so large a number. That is too small a current. China has several times as large an area as France. This refers to(涉及到) too large a class of circuits(电路)
Even so fundamental(基本的) a dimension(量纲) as time was measured(测量)extremely(极其) crudely(粗糙地) with sand and water clocks hundreds of years ago. Too low a frequency(频率) may actually(实际上) introduce(引起) spurious(寄生的) frequency components(分量).
思考题： 1、英译汉 Two parallel(平行的) rubber bands(橡皮筋) provide(提供) twice(两倍) as large a force(力) as one rubber band (does). 2、汉译英 数字传输(digital transmission)不需要像模拟(analog)传输那么高的信噪比(S/N ratio)。
Digital transmission need not/does not need as high an S/N ratio as analog transmission.