We hear in the 1637 Lycidas those same cries of unripeness and under-preparation that we had heard in the 1631 sonnet, "How soon hath Time, the subtle thief of youth."

我们在1637年的里听到过,与1631年的十四行诗相同的不成熟和未完成的呼喊，“时光如此飞快，如同偷走青春的窃贼“

耶鲁公开课 - 弥尔顿课程节选

Those B-cells also mature, they differentiate and that's what's shown on this slide here is the differentiation of those immature B-cells into mature B-cells.

这些B细胞也会变成熟,并且进行分化,这都展示在幻灯片上了,未成熟的B细胞分化为成熟的B细胞

耶鲁公开课 - 生物医学工程探索课程节选

What do immature B-cells do?

未成熟的B细胞都在做什么呢

耶鲁公开课 - 生物医学工程探索课程节选