これが→こうなるだけでしょ？

Rolls-Royce believes there will be little alternative to using the XG-40 as the basis for the Eurofighter engine, since no other engine company in the four cooperating nations has begun development work on any other concept.

　→　

IHI believes there will be little alternative to using the XF9 as the basis for the GCAP engine,
since no other engine company in the 三 cooperating nations has begun development work
on any other concept.

://www.secretprojects.co.uk/threads/rolls-royce-xg-40.40895/