Kutuzov's face as he stood in the open doorway remained perfectly immobile for a few moments.
Although the third order of lever is particularly inefficient when the fulcrum is rigid and immobile, it possesses singular advantages when these conditions are reversed, that is, when the fulcrum, as happens with the air, is elastic and yielding.
The stage is known as "paradoxical sleep" because of the combination of immobile muscles and heightened brain activity.
He grew up among enemies, and became artful, suspicious and self-controlled, concealing his feeling behind the mask of an immobile, almost repulsive, coldness.
Imagine for a moment that the sand grains were by any means rendered immobile without change in the permeability of their interspaces; we could then dispense with the iron or brickwork lining of the well; but as there would still be no cracks or fissures to extend the area of percolating water exposed to the open well, the yield would be very small.