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Sentence analysis
4Spans
Sentence
Span Details
心臓
heart (organ); guts; nerve; cheek; gall; heart (of something); central partnoun
が
subject markergrammar
どきっと
with a start; with a shock; startled-> ドキッとadverb
した。
under; below; beneath; bottom; lower part; younger; lower in rank; inferior; right after; no sooner than; trade-in; preliminary; preparatory-> 下noun, no-adjective, noun prefix