阻留

zhè zhǒng mó huì yǔn xǔ xiǎo fēn zǐ jìn rù dào xì bāo zhōng ér xiàng jī yīn wù zhì hé děng dà fēn zǐ zé huì bèi zǔ liú zài xì bāo zhī nèi

这种膜会允许小分子进入到细胞中，而像基因物质dna和rna等大分子则会被阻留在细胞之内。

Such membranes would allow small molecules to enter the cell while large molecules, such as the genetic materials DNA and RNA, would be trapped.