「並列共振部は、直列腕とラダー型フィルタを構成している」
誤:"A parallel resonance portion constitutes a series arm and a ladder filter."
正:"A parallel resonance portion constitutes a ladder filter with the series arm."
(直列腕は既述だったのでおかしいと気付いた)
27OCT2018後記:
"A parallel resonance portion, together with the series arm, constitutes a ladder filter."の方が良い?