看不见的
a impossible or nearly impossible to see; imperceptible by the eye
1.It is water, taking shape when it attacks, pke it did when the hurricane backed seawater into the plumbing, virtually unseeable until then.
它就是水 只有攻击的时候才会显形 所以它才会被飓风 回灌到下水道里 直到刚刚才显形