Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
English
⇄
Russian
Terms
for subject
Mathematics
containing
had it
|
all forms
English
Russian
it was not until the internal combustion engine had been well developed that propulsion of lighter-than-air aircraft became feasible
только после того как
the theory had to be developed to the point where it was useful in engineering design
доводить теорию до уровня
Get short URL