They might be 100 nanometers or so in diameter, whereas, a cell is ten microns or so in diameter.

直径只有一百纳米左右,而一个细胞的直径是十微米左右

耶鲁公开课 - 生物医学工程探索课程节选

Because of that you can't count on molecules moving rapidly over the size of a cell that's ten to 30 Microns in diameter.

因此不要对生物大分子能在,直径十到三十微米的,细胞里高速穿行抱有任何指望

耶鲁公开课 - 生物医学工程探索课程节选

Andrew Kent, a physicist at New York University, spends most days running electricity through a magnet smaller in diameter than a single cell, trying to determine the lowest current at which an electron's spin changes orientation.

FORBES: Magazine Article