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English Translation

lit.: viewing flowers on a horseback
fig.: a fleeting glance in passing, superficial understanding from cursory observation

Breaking it down

1. 走: to walk, to go
2. 马: horse
3. 观: to view
4. 花: flowers

Source: Google Image Search

Usage

具体国情构成国情整体，对具体国情进行深入研究、调查，不能走马观花，更重要的是这种微观要具有典型性研究。