"I think for us,we've already developed a successful paid-for model, which is working very well for us,".

VOA: standard.2009.12.05

It has a very well-developed muscular tissue and its function is to contract and relax, contract and relax.

该肌肉组织非常发达,用来使心脏收缩,放松,收缩,放松

耶鲁公开课 - 生物医学工程探索课程节选

Officials say the vehicles have saved hundreds,maybe thousands, of lives along Iraq's well-developed road network.

VOA: standard.2009.11.02