what would be your two greatest concerns about living abroad?

主要分两部分：1.financial concern经济方面，考虑到打工问题 2.social concern 社会方面，包括人际关系的处理（social intercourse）及适应新的生活环境，（包括文化方面等）。其实180字不多，按这个思路写下去恨容易。

My two greatest concerns about living aboard would be cultural gap and identity retention.

With globalization, we become increasingly aware of the distinct ways that people living in different parts of the world think and behave. These differences go well beyond the language barrier and manifest in lofty concepts, such as social norm or gender role, as well as in mundane protocols, such as personal space and dress codes.

In the European continent, for instance, it is customary to round up the bill in a restaurant if one really enjoyed the meal and the service. Transplanting the same restaurant to the US, that satisfied patron should then be prepared to tip his waiter an additional 15% to 20%, depending the locale. Moving again to Japan, however, that 15% tip would be considered a great insult to the wait-staff. A guest no