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Sentence analysis
6Spans
Sentence
Span Details
スパイ
spy; spyingnoun, suru verb
は
topic markergrammar
敵地
enemy territory; hostile placenoun
に
direction, time, indirect object, or target markergrammar
潜行
underwater navigation; submarine travel; going underground; hiding; travelling incognitonoun, suru verb
した。
light/support verb with a noun or noun-like phrase-> するgrammar