从地球上看，NGC 6744的大小差不多等于三分之二个满月。可惜的是，由于太过昏暗，我们惟有通过后院式望远镜才能观测到它。
Viewed from Earth, NGC 6744 is about two-thirds the size of a full moon, but it's so faint you can't see it without a backyard telescope.
系统而详实了解覆盖地球表面三分之二的海洋水域的化学特性、地形及水流特性代价高昂，但是可以实现的。
Systematic and detailed understanding of the chemistry, topography and flow of the waters that cover two-thirds of the planet would be costly, but it could be achieved.
美国地质调查局2007年进行的一项研究发现：如果北极地区的冰层持续融化，那么地球上三分之二的北极熊在本世纪中叶前就可能消失。
A 2007 study by the U.S. Geological Survey found that two-thirds of the polar bears on the planet could disappear by mid-century if Arctic ice keeps melting.
在此之前，在世界大多数地区，人们没有持续、长期的自然现象记录，占地球三分之二的洋面更是一片空白。
Before that, most parts of the world did not keep consistent, long-term records of natural events, and the oceans, two-thirds of the globe, were largely deserted.
地球的地核外部，大致到达中心三分之二的地方是熔化的铁。
The outer core of the Earth, about two-thirds of the way to the center, is molten iron.
这是因为地球表面的三分之二是由广阔的海洋组成的。
This is because two thirds of the earth's surface is made up of vast oceans.
首先，地球表面三分之二是海洋，尽管海洋确实提供了大量可作食物的鱼类．。
For one thing, two thirds of the earth's surface is water, although this does provide a lot of food in the form of fish.
这是因为地球表面的三分之二是由广阔的海洋构成的。
This is because two thieds of the earth's surface is made up of wast oceans.
但是，我们必须注意，如果说这位绅士按照地球经度子午线计算他才走完了一半路程，那么事实上他已经完成了三分之二以上的旅行计划。
Then it just became a matter of how we got the timber from the yard, over the fence, to the park and up the tree.
但是，我们必须注意，如果说这位绅士按照地球经度子午线计算他才走完了一半路程，那么事实上他已经完成了三分之二以上的旅行计划。
Then it just became a matter of how we got the timber from the yard, over the fence, to the park and up the tree.
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