Siden 1970'erne har forskerne været

Siden 1970'erne har forskerne været i gang med at finde ud af om dyr

Resultater (Engelsk) 1:

Since the 1970s, scientists have been in the process of finding out about animals

Resultater (Engelsk) 2:

Since the 1970s, scientists have been working to find out about animals

Resultater (Engelsk) 3:

since the 1970s, scientists have been trying to find out about animals