For random [theta], it is easy to see that any two neighboring edges in directional sensor networks are nearly independent with each other, here no longer expatiatory. To sum up, the coverage percolation can be approximately regarded as a bond percolation model.
[H.sub.i](x,y) and [X.sub.j] are too expatiatory to show in Table 3 and thus omitted, since we have indicated the specific method to get them in detail in Section 3.4.
Moreover, are there not other recent introductory or expatiatory texts, compendia of quotations and apposite remarks, which defend the idle life to the present public?