The surface formed mostly in the last billion years, which makes it fresher and more recently active than any rocky planet other than earth.

它的表面大部分是在过去十亿年里形成的，使得它比地球以外的任何岩石行星都更新鲜活跃。

youdao

CHAMFER: the flat surface formed by cutting away the sharp edges of two meeting surfaces.

倒角：两个表面相交处，通过切掉尖锐边缘形成的平面。

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Meanwhile, high surface hardness after heat treatment, the coating surface formed into the amorphous and crystalline mixture, the hardness is up to 1200hv.

同时表面硬度高，经热处理后，其镀层表面形成非晶态和晶态的混合物时，硬度可达1200 HV。

youdao

Yeast cells were grown in large numbers with this plasmid inside, they expressed the plasmid and so you made Hepatitis B surface antigen not in people but in cell culture where it was not normally formed.

体内携带这种质粒的酵母细胞大量增殖,它们表达质粒,因此,乙型肝炎表面抗原不是在人体内,而是在细胞培养环境下,以非正常方式形成的

耶鲁公开课 - 生物医学工程探索课程节选

The controversy arose in early 2012, when reports began to surface that newly formed tea-party and other conservative groups that had applied for tax-exempt status were receiving letters from the IRS asking for disclosure of their donors and other information that typically isn't requested of groups making such applications.

WSJ: IRS Apologizes for Scrutiny of Conservative Groups

The surface cooled, a crust formed, and oceans condensed upon it.

NEWYORKER: The Martian Chroniclers

Detailed studies of the surface indicate that these were formed by a lake caused by the flow of underground water that periodically made its way to the bottom of the crater.

FORBES: NASA Finds Remains Of Ancient Martian Lake