the cells

• He entered the cell and presented the letter to the aristocrat .
  他走进牢房把信交给贵族。
• This lignification serves to stiffen and strengthen the cells .
  木质化足以使细胞变硬和增强。
• The cells have an irregular shape with a slightly serrated border .
  细胞的形状不规则，边缘呈锯齿状。
• A spherical or oval nucleus is near the centre of the cell .
  在细胞的近中央处，有一个圆形或卵圆形核。
• The primary site of ozone attack on the cell is the plasmalemma .
  臭氧在细胞上侵蚀的初始部位就是质膜。
• This introduction has been devoted to a brief glimpse of the cell wall .
  本书专门论述细胞壁的主要概况。
• There the cells divide rapidly to form a single layer of skin .
  细胞在其中迅速分裂，并形成一个单层的皮肤。
• Outward currents therefore increase electronegativity in the cell interior .
  外向电流因此能增加细胞内的负电性。
• In order to fuse, intracellular vesicles have to move within the cell .
  为了融合，细胞内的囊泡必须在细胞内运动。
• The entry of the bacteria is apparently facilitated by the loosening of the cell walls .
  细胞壁松散易使细菌侵入。