The explanation for this must lie in the biochemical maturity of eight-celled embryos compared with their junior, four-cell siblings.

对于这一现象只能解释为，在生化意义上发育至八个细胞的胚胎比只有4个细胞的初级胚胎要成熟。

youdao

Junior Achievement Incorporated and Junior Achievement International combined their operations in two thousand four.

VOA: special.2009.11.27

He jumped from Morgan Stanley and recruited four junior executives from other firms to join him.

FORBES: Wall Street's Hiring Spree

The New York-based team was downsizing, and the four most junior members, including me, were being let go.

FORBES: Bouncing Back After A Lay-Off

Since Pettitte had enrolled in a junior college instead of a four year program, the draft rules at the time had allowed the Yankees to follow Pettitte and still negotiate a deal with him up until the day before the 1991 draft.

FORBES: A Fond Farewell To Yankee Stalwart Andy Pettitte