It has a fairly large number of characters, although only a relatively few number of them speak in the book.

有很多角色，但仅其中相对少数,在书中发言。

耶鲁公开课 - 政治哲学导论课程节选

It involves putting a needle, a fairly large needle into usually one of the pelvic bones and collecting marrow from which is tissue that's deep inside those bones.

先要用针头,相当大的针头刺进你的盆骨,然后进行收集,这些在骨头深处的骨髓

耶鲁公开课 - 生物医学工程探索课程节选

Now, the polio vaccine that Salk produced was very effective, but it required a fairly large dose of the vaccine and it had to be injected into the arms of children.

索尔克生产的小儿麻痹症疫苗效果显著,但是,该疫苗的单支注射剂量非常大,而且必须通过小孩的手臂进行注射

耶鲁公开课 - 生物医学工程探索课程节选

Hormones can be proteins, endocrine hormones can be proteins, meaning they're large molecules that are usually fairly water soluble, or they can be steroids.

激素可以是蛋白,内分泌激素可以是蛋白,这意味着激素是大分子,并且通常是水溶性的,激素也可以是类固醇

耶鲁公开课 - 生物医学工程探索课程节选