Swimming is helpful for bones that are porous and weak.游泳有助于改善骨质疏松和骨骼脆弱。The water slowly drained away, down through the porous soil.水慢慢流走了，渗入了疏松的土壤。He added sand to the soil to make it more porous.他往土里掺沙子以提高渗水性能....
Paradoxically, another glutamate - booster , D - cycloserine, is being tested not to enhance memory, but to abolish it.矛盾的是, 另一种谷氨酸酯提升剂, D-cycloserine测验表明不能增强记忆, 反而是相反....