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to have two things (at the same time) (e.g. good and bad points); to also have something (in addition to something else)
彼は厳しさと優しさを合わせ持つ。
He combines strictness with kindness.
この素材は軽さと強度を合わせ持っている。
This material combines lightness with strength.
豊富な知識と現場の経験を合わせ持った人物が求められている。
Someone combining rich knowledge with field experience is needed.