However, the choice of a substitute for reconstruction of the cruciate ligament in order to achieve good clinical effect is controversial. 但是,目前人们对于选择何种替代物重建交叉韧带才能取得好的临床效果还有争议。
Because of its advantages, such as a rich source of raw materials, low price, renewable, alleviating the environment pollution and the food crisis, etc., butanol fermentation from corn stalk has become one of the most important choice of substitute for petroleum energy. 而以秸秆为原料发酵生产的新一代生物燃料一丁醇,具有原料来源广泛、价格低廉、可再生、缓解环境危机和粮食危机等优点,已成为替代石油能源的重要选择之一。