This surface layer thickens at an early stage in a mouse after 8 days of development.

发育8天后，老鼠早期胚胎的,外胚层开始增厚。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

At Dvoinoye in Russia, development of an exploration decline and construction of surface facilities is on schedule, as are procurement and engineering, Kinross said.

FORBES: Kinross: Tasiast-Expansion Commitment To Hit $1 Billion By Year-End; Production Set For 2014

The sea ice expanded during Southern Hemisphere autumn and winter in response to the development of a fresh, cool surface water layer, which floated on the denser, warmer salty sea water below.

BBC: Melt may explain Antarctica's sea ice expansion

The Dvoinoye project is progressing, with 52% of the underground development complete and surface infrastructure 45% finished.

FORBES: Kinross: Main Focus Will Be On Increasing Margin And Prioritizing Cash Flow