Translation/Meaning of "fail to understand" — Japanese-English & English-Japanese Translation Dictionary

fail to understand 郎グ国

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fail to understand: なんのことかわからないル・カレ著村上博基訳『パーフェクト・スパイ』(A Perfect Spy ) p. 23

for some reason which I fail to understand: どういう理由でかル・カレ著村上博基訳『スクールボーイ閣下』(The Honourable Schoolboy )