-Trade capability. 来自 Cambridge English Corpus Integrins contain domains that bind divalent cations that are essential for receptor-ligand interactions linking extracellular molecules, the actin cytoskeleton and cytoplasmic signaling proteins. 来自 Cambridge English Corpus Brownian dynamics study of the multiply-occupied cation 当淘宝商家拒绝退款、拖延到账甚至“人间蒸发”，消费者权益... https://concrete-foaming-agent04815.muzwiki.com/46651/surfaktant_an_overview