Not all China Eastern Airlines’ A321s have the same structure. Some have 2 rows of first class and some have 5 rows of first class. It can only be said that 37L is the window on the right side of the front cabin. Economy class starts from row 31. If there are few seats in first class, row 37 should be at the leading edge of the wing. The downward view will be partially blocked by the engine, so it should be fine going forward. But if there are more first-class seats, row 37 may only be able to see the wings of the plane.