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Sentence analysis
7Spans
Sentence
Span Details
秘密
secret; confidential; private; mystery; secret (to success, etc.); key; esoteric teachingsnoun, na-adjective
諜報員
intelligence operative; spynoun
が
subject markergrammar
敵地
enemy territory; hostile placenoun
に
direction, time, indirect object, or target markergrammar
潜入
infiltration; sneaking in; going undercovernoun, suru verb
した。
light/support verb with a noun or noun-like phrase-> するgrammar