As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.

与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。

youdao

Now, for a customer base, the most obvious example would be a large office building since the employees could theoretically go shopping after work or during their lunch hour, right?

那么，对于客户来讲，最明显的例子就是大型办公楼，因为理论上员工可以在下班后或午餐时间去购物，对吧？

youdao

Modern methods for tracking polar bear populations have been employed only since the mid-1980s, and are expensive to perform consistently over a large area.

跟踪北极能种群的现代方法仅在20世纪80年代中期才被采用，而且，要在大范围内连续采用这种方法，其代价非常高昂。

youdao

This is the first incident in which NATO forces have been blamed for the deaths of large numbers of civilians since General McChrystal took command of foreign forces in Afghanistan two months ago.

VOA: standard.2009.09.07

They are now net-long 110, 459 contracts, the smallest since March 12, and just above the March 5 level of 95, 012, the lowest for the large speculators since Dec. 9, 2007.

FORBES: FOCUS: Speculators Continue To Sell Gold, Silver Futures, Options -- CFTC

In addition, the People's Bank of China cut its reserve requirement ratio for large banks for the first time since December 2008, following a modest easing for small rural banks last month.

WSJ: Central Banks Propel Asia Markets

If STC achieves these goals, the outcome could be profitable for investors since one large company has already approached STC about a possible acquisition.

FORBES: Can Story To College Achieve its Goals?