lit. flower viewing from horseback (idiom); a fleeting glance in passing
fig. superficial understanding from cursory observation
to make a quick judgment based on inadequate information
Definitions (Wiktionary)
phrase, figuratively, idiomatic
to make a hurried and cursory observation; to gain only a superficial understanding of something (syn.) 蜻蜓点水, 走马看花, 走馬看花, 蜻蜓點水