myofibrils [maɪɔ:'faɪbrɪlz]

例句:

• Hypertrophy also allows the abnormally high pressure to be developed by a greater number of myofibrils.
  肥厚也可使大量肌纤维产生异常高的压力.
  
• Each of your muscle cells is packed full of thinner fibres called myofibrils.
  来自BBC