Libyan immigrant army

Generally, I will answer you in detail, but this time neither question involves grammatical right or wrong. Both questions are about how free translation can be. Your understanding is correct, but translation is just another way of saying it.

In the first sentence, Libya and other parts of North Africa belong to North Africa. It can be said that translation is equivalent to extracting the common factor of North Africa.

In the second sentence, geographically, it is opposite, and crossing is opposite, isn't it?