It means that "He was watching the mountains carefully."
Answer: Because living in Asia–especially Southeast Asia in my opinion–is more attractive than it’s ever been. Having a base here is more realistic and achievable than ever for Western expats, long-term travelers and digital nomads.
The picture in the story resembles the friendship they have. No matter what they will still be together in each others heart. Their friendship is a very strong everlasting bond that they have had since they were young. Lastly, that even though they are apart they will still have contact and be friends. They will never forget each other, and will always remember their friendship.<span />
Hello iiejlaw,
Actually what does the question mean? Can you just comment? Don't worry. I will edit my answer, after you say the question ok?
compressional/primary waves and shear/secondary waves