"For the first time a serious crack had appeared in the armor of the variability hypothesis".

As one corner sank under its own weight, serious cracks were produced.

Engineers then discovered the second, less serious crack.

There are serious cracks within the Democratic ranks, though.

However, in 1960, serious cracks were discovered in one of the 45-year-old dams.

"Once you've got a serious crack through the gelatin layer, it often doesn't go back."

If there was a serious crack in the case, Duvall would have let him know.

More ominous still were the first serious cracks in the Church's spiritual hegemony.

After the earthquake, a number of old buildings had to be condemned due to serious cracks in the foundations.

The first serious cracks in the Reich have appeared.