zhè / zhǒng / xì / bāo / de / biǎo / miàn / wài / mó / néng / gòu / bāng / zhù / tā / dǐ / yù / wài / jiè / huán / jìng这种细胞的表面外膜能够帮助它抵御外界环境。The surface coat of this type of cell helps it withstand the external environment.