wear-and-tear

Over time, they also close against each otherwith very little wear and tear,which explains how this mechanism continues to work seamlessly

So I was curious:if such wear and tear is inevitable,how on earth does Mother Nature make sure

because today we pay for our maintenanceand wear and tear on our cars with gas taxes.And as we get our cars more fuel-efficient,

a position that puts uneven pressure on your spine.Over time, this causes wear and tear in your spinal discs,overworks certain ligaments and joints,

impair your body's ability to deal with the forces on it.Poor posture inflicts extra wear and tear on your joints and ligaments,increases the likelihood of accidents,