That's why Mr. Romney's approach might pose a risk.

One problem which such an approach may pose is that there may be nothing left for special treatment.

This approach has worked relatively well in practice, but poses some scalability challenges.

The approach of Eighth Army was also now posing a threat.

But all alternative approaches pose even greater problems.

Such an approach would pose a hardship to agencies that are anticipating increases but would appeal to fiscal conservatives who want to hold down spending.

The approach of World War II also posed a problem.

Such an approach poses significant definitional issues.

It is not technically difficult, but the approach through dense forest and undergrowth poses the biggest challenge.

The approach posed no threat to Earth.