Astronauts on the international space station took in this view of the north coast of the caspian sea and two river deltas in kazakhstan and russia on september 11 , 2010 .
I 've been throwing around this concept of deltas , but I haven 't stopped to describe them .
我已经抛出了增量这个概念,但是我没有停下来描述过它们。
Economic costs , though , are rising as people and industrial activity cluster in disaster-prone areas such as river deltas and earthquake fault lines .
由于人类和工业活动集中在有灾害倾向的地区如河流三角洲或地震断层,经济损失在增加。
Many deltas are triangular in shape .
很多三角洲是三角形的。
A more complex move function taking absolute movement deltas .
一个更加复杂的运动函数,每次都绝对运动。
One estimate puts 8.7m more people at risk of flooding in deltas by 2050 if sea level follows current trends .