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抗ウイルス薬
antiviral drugnoun
の
possession, attribution, nominalizer, or nominal linkergrammar
開発
development; cultivation; application; exploitation (of resources)noun, suru verb
が
subject markergrammar
進ん
advance; go forward; move ahead; precede; go ahead; lead; make progress; improve; deepen; heighten; intensify; be fast (clock); be ahead; gain time; do willingly; do of one's own accord-> 進むgodan verb
でいる。
ongoing or resultant state-> ているgrammar