常見例句雙語例句When the polymer forms a condensed, well-defined layer closely surrounding the cell, it is called the capsule.當(dāng)這些緊緊圍繞細(xì)菌的的多聚體形成濃集，邊界明顯的一層時(shí)稱為莢膜。basic.shsmu.edu.cn 返回 well-defined polymer