For me the main point to look at here is the adjusted R² of 0.02 which basically tells us that the country of origin alone is not a great predictor of cultural adjustment and that we cannot derive any practical conclusions.
Seeing as potentially important control variables or other predictors have not been included in the model we cannot be sure for example that gender, years spent in the US (prior to test), income / social status of parents, etc. do not play a heavy role or influence the result.
So practically the interpretation would be that the model isn't conclusive and more work needs to be done.
Depending on the scale of "cultural adjustment" the confidence interval supports this interpretation basically telling us that a student from Hong Kong is likely to score the same or much better than a mainland Chinese student, which is to say,the model isn't confident at all (unless the scale is 1-100 or higher in which case the model would be confident in seeing no differences).