The field has weakened about 10% in the last 150 years.

Either the field was weakening, or the creatures were getting stronger and more determined.

Soon after, the field weakens and Gamera is free.

When the number of free charges drops or the electric field weakens, the phenomenon ceases.

The main magnetic fields will weaken, and then almost vanish.

It is correct that a gravitational field weakens with distance, but never completely vanishes.

The field weakens while the shift takes place.

When damaged, they slow down and the field weakens.

He knew why the field might weaken - its tendency to miniaturize the surroundings.

What hap-pened to our ship was that the magnetic field weakened.