But recently the inland waterways, docks and fresh-water intakes of North America have been overrun by zebra and quagga mussels-species that originate from the area around the Black Sea.
但是，最近北美的内陆水道、码头和淡水入口蔓生了一种原存于黑海区域的斑马蛤贝和白斑马蛤贝。
2
The Baltic Sea's unusual mix of freshwater and Marine species means it's also especially vulnerable to environmental changes.
在波罗的海，淡水和海洋生物很不寻常的结合在一起，这已经表明它很容易受到环境变化的影响。
3
The results shows that the main component of freshspecies is water, it contains 69.0% moisture.