0 If a course of action, plan, etc. is impracticable, it is impossible to do in an effective way. -- （行动方案、计划等）行不通的，不可行的
Also, non-linearities in cell responses make, for example, multiplexing of luminance and chromatic signals in the parvocellular pathway impracticable.
However, in our case, about 70000 levels resulted from the considered configurations, which make the direct calculations almost impracticable in time.
However, cordons sanitaires - that is, strict protection of a linear border - had become increasingly impracticable.
But, till a gravity network of ideas replaced the flat-earth network, the idea that the earth was round was also too impracticable to suggest.
Unfortunately, such a sweeping scope of moral concern for the prima facie duty of nonmaleficence is highly impracticable.
Some commentators certainly think that, though the scheme may ultimately be impracticable, it is in principle the appropriate egalitarian policy.
They are somewhat impracticable to use because of the difficulty in describing them.
In the case of passenger traffic this would be impracticable, and the only solution of the problem is extensive clearing.
