The most difficult problem in translation is Idioms
because you cannot suggest or guess the meaning from context
you should look up for the word or phrase in the dictionary
to be able to understand with native speaker very well
He looks blue
المعنى الحرفي : هو يبدو ازرقاً
المعنى المجازي : هو يبدو حزيناً
also some of them are funny
It rains cats and dogs
المعنى الحرفي : انها تمطر قططاً و كلاباً
المعنى المجازي : انها تمطر بغزاره ,,,,,,,,,,,,
^_^ thank you very much for the interesting topic