to  scratch the surface
<abbr style="text-decoration: underline;" title="scratch / scrape" > scratch</abbr>
skræʧ
skrāch
the
ðə
dhē
surface
sɜ:fɪs
sēfis

英語での「 scratch the surface」の定義と意味

to scratch the surface
01

to fail to deal with all aspects of a problem, topic, etc. 

慣用句
くだけた
The introductory course only scratches the surface of the subject; to truly master it, one must pursue advanced studies. 
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