Sentence examples for a main problem is that from inspiring English sources

A main problem is that lines derived from crosses of elite and exotic parents lack adaptation and their agronomic performance is so poor that they cannot be directly used in the breeding process.

The main problem is that, compared with other parts of the world, costs are not low.

The mini-series's main problem is that six-hour running time.

The main problem is that A* is not adapted for intensive computation on large networks that consisting of millions of vertices and edges.

The main problem is that old computer systems store customer data in lots of different places.

The main problem is that most suspects are dead.

Asked for comment, Viviane Reding, the vice president of the European Commission and the architect of the proposed regulation, said in a statement: "The main problem is that our rules predate the digital age and it became increasingly clear in recent years that they needed an update".

(IDI with a community representative) The main problem is that the current system used by the district is not good.

Yet the idea, if embraced, could bring a lot more stability.The main problem is that most Arab leaders think that decentralising power risks their losing it altogether.

Only small amounts of metal are needed, though, so the end result is a cheap and flexible material.The main problem is that the alternating current created is very high frequency.

If so, this is on a par with a loss of $5.5 billion in 2001.Ford's main problem is that its share of the American market for new cars, still the world's biggest, is now just 17%, down from around a quarter a few years ago.