Bu kazaya neyin sebep olduğu tam bir sır.
- It is a complete mystery what caused the accident.
Yangına dikkatsiz bir sigara içicisinin sebep olduğu ortaya çıktı.
- It transpired that fire was caused by a careless smoker.
... >> That are said to have been caused by old planes due to sanctions on new purchases--if ...
... have already caused the extinction of many species. The question is, is that going ...