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Why JLPT N1 learners mix up 補足 (ほそく, “supplement, complement”) and 沿線 (えんせん, “along railway line”).
In tourism or logistics, supplementary (補足) information is often provided for locations along the railway line (沿線). Learners might swap the action of adding info with the specific geographical area it describes.
On JLPT N1, this pair shows up as a vocabulary meaning question. You see one word and pick its English equivalent from four options — one of which will be the other word in this pair, chosen as a distractor precisely because of the overlap.
Reading the explanation is step one. Targeted practice is what actually moves a confusion pair out of your weak list. Free, no signup needed to try.
Practice N1 confusion pairsSpot a mistake in this explanation? Email us. Explanations are AI-generated and human-reviewed; corrections welcome.