实力

A country's survival hinges on its economic power./A country's survival hinges on its financial strength.

The air power of the country is declining/failing/faltering/waning.

The naval power of the country is growing/increasing.

He underestimated the enemy's strength.

political/economic strength

national defence capabilities

match each other in strength; be well matched in strength

build up/better one's power/strength

increase the military strength

recover one's strength