Minutes later, with McGrady posting up, Wells faked a cut toward the free-throw line, then took off backdoor, taking a no-look bouncepass from McGrady for another layup.
And that’s only half the battle: Once the waves bounce off any targets, they must pass back through the wall to reach the radar’s receivers — and again, 99 percent don’t make it.
并且这还只是整个进程的一半：一旦电波碰到目标物体反射，它们必须再次穿过墙壁返回雷达的接收器。
3
Without the tunnel mouth being properly set up a derailed train will bounce off an invisible barrier when it tries to pass under the ground.